{"id":7703,"date":"2026-06-16T10:40:45","date_gmt":"2026-06-16T10:40:45","guid":{"rendered":"https:\/\/researcher.life\/blog\/?p=7703"},"modified":"2026-06-22T05:08:17","modified_gmt":"2026-06-22T05:08:17","slug":"what-is-purposive-sampling-methods-techniques-and-examples","status":"publish","type":"post","link":"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/","title":{"rendered":"What is Purposive Sampling? Methods, Techniques, and Examples"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_68 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Glossary_of_Key_Terms\" title=\"Glossary of Key Terms\">Glossary of Key Terms<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Key_Takeaways\" title=\"Key Takeaways\">Key Takeaways<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_is_purposive_sampling\" title=\"What is purposive sampling?\u00a0\">What is purposive sampling?\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Definition\" title=\"Definition\">Definition<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Where_It_Fits_in_Study_Design\" title=\"Where It Fits in Study Design\">Where It Fits in Study Design<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#When_and_Why_to_Use_Purposive_Sampling\" title=\"When and Why to Use Purposive Sampling\">When and Why to Use Purposive Sampling<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Fit_with_Quantitative_Qualitative_and_Mixed-Methods_Research\" title=\"Fit with Quantitative, Qualitative, and Mixed-Methods Research\">Fit with Quantitative, Qualitative, and Mixed-Methods Research<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Purposive_sampling_methods_and_examples\" title=\"Purposive sampling methods and examples\u00a0\">Purposive sampling methods and examples\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Homogeneous_sampling\" title=\"Homogeneous sampling\u00a0\">Homogeneous sampling\u00a0<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#_Example\" title=\"\u00a0Example:\u00a0\u00a0\">\u00a0Example:\u00a0\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Typical_case_sampling\" title=\"Typical case sampling\u00a0\">Typical case sampling\u00a0<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#_Example-2\" title=\"\u00a0Example:\u00a0\u00a0\">\u00a0Example:\u00a0\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Maximum_variation_or_heterogeneous_sampling\" title=\"Maximum variation (or heterogeneous) sampling\u00a0\">Maximum variation (or heterogeneous) sampling\u00a0<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Example\" title=\"Example:\u00a0\u00a0\">Example:\u00a0\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Extreme_or_deviant_case_sampling\" title=\"Extreme (or deviant) case sampling\u00a0\">Extreme (or deviant) case sampling\u00a0<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Example-2\" title=\"Example:\u00a0\">Example:\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Critical_case_sampling\" title=\"Critical case sampling\u00a0\">Critical case sampling\u00a0<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#_Example-3\" title=\"\u00a0Example:\u00a0\u00a0\">\u00a0Example:\u00a0\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Expert_sampling\" title=\"Expert sampling\u00a0\">Expert sampling\u00a0<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Example-3\" title=\"Example:\u00a0\u00a0\">Example:\u00a0\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Step-by-step_guide_to_purposive_sampling_with_examples\" title=\"Step-by-step guide to purposive sampling with examples\u00a0\">Step-by-step guide to purposive sampling with examples\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Advantages_and_disadvantages_of_purposive_sampling\" title=\"Advantages and disadvantages of purposive sampling\u00a0\">Advantages and disadvantages of purposive sampling\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Advantages_of_purposive_sampling\" title=\"Advantages of purposive sampling\u00a0\">Advantages of purposive sampling\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Disadvantages_of_purposive_sampling\" title=\"Disadvantages of purposive sampling\u00a0\">Disadvantages of purposive sampling\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Guidance_by_Academic_Level\" title=\"Guidance by Academic Level\">Guidance by Academic Level<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#For_Undergraduate_Students\" title=\"For Undergraduate Students\">For Undergraduate Students<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#For_Graduate_Students\" title=\"For Graduate Students\">For Graduate Students<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Implementation_Checklist\" title=\"Implementation Checklist\">Implementation Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Common_Mistakes_to_Avoid\" title=\"Common Mistakes to Avoid\">Common Mistakes to Avoid<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#Frequently_asked_questions\" title=\"Frequently asked questions\u00a0\">Frequently asked questions\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_is_the_difference_between_purposive_sampling_and_convenience_sampling\" title=\"What is the difference between purposive sampling and convenience sampling?\u00a0\">What is the difference between purposive sampling and convenience sampling?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_is_the_difference_between_purposive_sampling_and_random_sampling\" title=\"What is the difference between purposive sampling and random sampling?\u00a0\">What is the difference between purposive sampling and random sampling?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_is_the_sample_size_for_purposive_sampling\" title=\"What is the sample size for purposive sampling?\u00a0\">What is the sample size for purposive sampling?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_is_the_purpose_of_sampling_in_research\" title=\"What is the purpose of sampling in research?\u00a0\">What is the purpose of sampling in research?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_are_the_principles_of_purposive_sampling\" title=\"What are the principles of purposive sampling?\u00a0\">What are the principles of purposive sampling?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#How_is_purposive_sampling_conducted\" title=\"How is purposive sampling conducted?\u00a0\">How is purposive sampling conducted?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_type_of_research_uses_purposive_sampling\" title=\"What type of research uses purposive sampling?\u00a0\">What type of research uses purposive sampling?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/researcher.life\/blog\/article\/what-is-purposive-sampling-methods-techniques-and-examples\/#What_is_an_example_of_purposive_sampling\" title=\"What is an example of purposive sampling?\u00a0\">What is an example of purposive sampling?\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Glossary_of_Key_Terms\"><\/span>Glossary of Key Terms<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"160\"><strong>Term<\/strong><\/td>\n<td width=\"464\"><strong>Definition<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"160\">Purposive Sampling<\/td>\n<td width=\"464\">A non-probability technique where the researcher deliberately selects participants or cases based on specific traits relevant to the study.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/researcher.life\/blog\/article\/population-vs-sample-difference-examples\/\">Population<\/a><\/td>\n<td width=\"464\">The complete group of people, events, or cases a researcher wants to draw conclusions about.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Sample<\/td>\n<td width=\"464\">The subset of the population actually studied.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Sampling Frame<\/td>\n<td width=\"464\">A list or source from which a sample is drawn; often loosely defined in purposive sampling.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/researcher.life\/blog\/article\/what-is-non-probability-sampling-methods-types-and-examples\/\">Non-Probability Sampling<\/a><\/td>\n<td width=\"464\">Sampling where units are chosen using researcher judgment rather than random chance.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/researcher.life\/blog\/article\/what-is-sampling-bias-definition-types-and-examples\/\">Sampling Bias<\/a><\/td>\n<td width=\"464\">Systematic error introduced when some population members are more likely to be selected than others.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.com\/blog\/internal-validity-external-validity-definition-differences-examples\/\">Internal Validity<\/a><\/td>\n<td width=\"464\">The degree to which a study accurately demonstrates a cause-and-effect or in-depth relationship within the sample studied.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.com\/blog\/internal-validity-external-validity-definition-differences-examples\/\">External Validity<\/a><\/td>\n<td width=\"464\">The degree to which findings can be generalized beyond the specific sample studied.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.com\/insights\/an-introduction-to-sample-size-effect-size-and-statistical-power-for-biomedical-researchers\">Sample Size<\/a><\/td>\n<td width=\"464\">The number of participants or cases included in a study.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.com\/blog\/types-of-study-designs-in-biomedical-research\/\">Study Power<\/a><\/td>\n<td width=\"464\">The probability that a study will detect a true effect if one exists; central to quantitative designs.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.com\/blog\/effect-size\/\">Effect Size<\/a><\/td>\n<td width=\"464\">A quantitative measure of the magnitude of a phenomenon or relationship.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.com\/blog\/types-of-study-designs-in-biomedical-research\/\">Study Design<\/a><\/td>\n<td width=\"464\">The overall strategy used to integrate the components of a study in a logical, coherent way.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.com\/insights\/how-to-choose-a-research-question\">Research Question<\/a><\/td>\n<td width=\"464\">The specific question a study is designed to answer.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/www.editage.us\/blog\/what-are-research-objectives-how-to-write-a-good-research-objective-with-examples\/\">Research Objectives<\/a><\/td>\n<td width=\"464\">The concrete goals that operationalize the research question.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><a href=\"https:\/\/researcher.life\/blog\/article\/what-is-data-saturation-definition-types-examples-indicators\/\">Data Saturation<\/a><\/td>\n<td width=\"464\">The point in qualitative data collection at which new data no longer reveals new themes.<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Information Power<\/td>\n<td width=\"464\">A concept describing how much relevant information a sample holds for the study aims, used to judge adequacy of sample size in qualitative work.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Purposive sampling is a non-probability method built around deliberate, judgment-based selection of cases that closely match the research question and objectives.<\/li>\n<li>It is the dominant sampling approach in <a href=\"https:\/\/researcher.life\/blog\/article\/what-is-qualitative-research-methods-types-examples\/\">qualitative research<\/a> and is also used in <a href=\"https:\/\/www.editage.com\/blog\/mixed-methods-research\/\">mixed-methods designs<\/a> for the qualitative component.<\/li>\n<li>It strengthens internal validity by ensuring information-rich cases, but typically weakens external validity because samples are not representative.<\/li>\n<li>Sample size is usually justified through data saturation or information power rather than statistical power and effect size calculations.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"What_is_purposive_sampling\"><\/span><b><span data-contrast=\"auto\">What is purposive sampling?<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Definition\"><\/span>Definition<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Purposive sampling, also called judgmental or selective sampling, is a non-probability technique in which the researcher uses expert knowledge and predefined criteria to handpick participants or cases. Selection is guided directly by the research question and research objectives rather than by random chance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Where_It_Fits_in_Study_Design\"><\/span>Where It Fits in Study Design<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Purposive sampling fits naturally into qualitative study designs (<a href=\"https:\/\/researcher.life\/blog\/article\/what-is-a-case-study-in-research-definition-methods-and-examples\/\">case studies<\/a>, <a href=\"https:\/\/researcher.life\/blog\/article\/what-is-ethnographic-research-methods-and-examples\/\">ethnography<\/a>, <a href=\"https:\/\/researcher.life\/blog\/article\/grounded-theory-in-research-types-steps-examples\/\">grounded theory<\/a>, phenomenology) and into the qualitative strand of mixed-methods designs. It is less common in purely <a href=\"https:\/\/researcher.life\/blog\/article\/what-is-quantitative-research-types-and-examples\/\">quantitative study designs<\/a> because it does not support unbiased statistical inference.<\/p>\n<p><a href=\"https:\/\/app.adjust.net.in\/9a5h9w2?campaign=R%20Blog&amp;adgroup=discovery-heroarticle-what-is-purposive-sampling&amp;fallback=https%3A%2F%2Fdiscovery.researcher.life%2F%23content_marketing_adjust_blog\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6730 size-full\" src=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/08\/blog-banner_extra.png\" alt=\"\" width=\"656\" height=\"250\" srcset=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/08\/blog-banner_extra.png 656w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/08\/blog-banner_extra-300x114.png 300w\" sizes=\"auto, (max-width: 656px) 100vw, 656px\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"When_and_Why_to_Use_Purposive_Sampling\"><\/span>When and Why to Use Purposive Sampling<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Used when the goal is depth of understanding rather than statistical generalizability.<\/li>\n<li>Appropriate when participants must hold specific knowledge, experience, or characteristics tied to the research question.<\/li>\n<li>Useful for exploratory research where little is known about a phenomenon.<\/li>\n<li>Common in studies of rare populations, expert opinion, or unique case examples.<\/li>\n<li>Helpful when resources or timelines limit the feasibility of probability sampling.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Fit_with_Quantitative_Qualitative_and_Mixed-Methods_Research\"><\/span>Fit with Quantitative, Qualitative, and Mixed-Methods Research<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"208\"><strong>Approach<\/strong><\/td>\n<td width=\"208\"><strong>Typical Role of Purposive Sampling<\/strong><\/td>\n<td width=\"208\"><strong>Example<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"208\">Qualitative<\/td>\n<td width=\"208\">Primary sampling strategy for in-depth, information-rich cases<\/td>\n<td width=\"208\">Interviewing 12 nurses with direct experience of a specific protocol<\/td>\n<\/tr>\n<tr>\n<td width=\"208\">Quantitative<\/td>\n<td width=\"208\">Rarely used as the primary method; weak basis for <a href=\"https:\/\/www.editage.com\/blog\/guide-to-types-of-inferential-statistics-for-biomedical-researchers\/\">inferential statistics<\/a><\/td>\n<td width=\"208\">Selecting &#8220;typical&#8221; schools to pilot-test a survey instrument<\/td>\n<\/tr>\n<tr>\n<td width=\"208\">Mixed Methods<\/td>\n<td width=\"208\">Used for the qualitative phase, often alongside probability sampling for the quantitative phase<\/td>\n<td width=\"208\">Surveying a random sample, then purposively interviewing outlier respondents<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Purposive_sampling_methods_and_examples\"><\/span><b><span data-contrast=\"auto\">Purposive sampling methods and examples<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Purposive sampling<\/span><span data-contrast=\"auto\"> approaches entail selecting participants based on specified criteria or features related to the research subject. There are various sorts of <\/span><span data-contrast=\"auto\">purposive sampling<\/span><span data-contrast=\"auto\"> methods that can be utilized depending on the type of research and research objectives:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<table width=\"624\">\n<thead>\n<tr>\n<td width=\"187\"><strong>Type<\/strong><\/td>\n<td width=\"437\"><strong>Description<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"187\">Maximum Variation<\/td>\n<td width=\"437\">Selects cases that differ widely on key characteristics to capture diverse perspectives.<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Homogeneous<\/td>\n<td width=\"437\">Selects cases that share very similar characteristics to study a narrow, specific group in depth.<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Typical Case<\/td>\n<td width=\"437\">Selects cases that represent what is considered &#8220;normal&#8221; or average for the phenomenon.<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Extreme or Deviant Case<\/td>\n<td width=\"437\">Selects unusual or outlier cases to learn from atypical outcomes.<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Criterion Sampling<\/td>\n<td width=\"437\">Selects all cases that meet a predetermined criterion.<\/td>\n<\/tr>\n<tr>\n<td width=\"187\">Expert or Key Informant<\/td>\n<td width=\"437\">Selects individuals with specialized knowledge relevant to the topic.<\/td>\n<\/tr>\n<tr>\n<td width=\"187\"><a href=\"https:\/\/researcher.life\/blog\/article\/grounded-theory-in-research-types-steps-examples\/#3_Theoretical_Sampling\">Theoretical Sampling<\/a><\/td>\n<td width=\"437\">Selects cases as theory develops, common in grounded theory studies.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"Homogeneous_sampling\"><\/span><b><span data-contrast=\"auto\">Homogeneous sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Homogeneous sampling<\/span><span data-contrast=\"auto\">, a <\/span><span data-contrast=\"auto\">purposive method<\/span><span data-contrast=\"auto\">, minimizes variation in the selected sample for a simpler and more robust analysis. It enables an in-depth exploration of a specific subgroup, with individuals sharing similar attributes like demography, perspectives, occupations, or cultures. The focus in <\/span><span data-contrast=\"auto\">homogenous sampling<\/span><span data-contrast=\"auto\"> is on commonalities among samples and their relevance to the research topic.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"_Example\"><\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span data-contrast=\"auto\">Example:\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span data-contrast=\"auto\">In a study aimed at comprehending the unique experiences of long-term employees in a high-demand IT industry, researchers may employ <\/span><span data-contrast=\"auto\">homogeneous sampling<\/span><span data-contrast=\"auto\">. This involves selecting participants from the same corporate setting, focusing on criteria such as (i) full-time employment, (ii) a minimum of five years in the IT industry, and (iii) high levels of work-related stress. Analyzing this targeted group enables an in-depth exploration of work-related stress, coping mechanisms, and the potential impacts of mitigating measures.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-11381\" src=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2024\/01\/PDF-Banner-1.png\" alt=\"\" width=\"2136\" height=\"351\" srcset=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2024\/01\/PDF-Banner-1.png 2136w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2024\/01\/PDF-Banner-1-300x49.png 300w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2024\/01\/PDF-Banner-1-1024x168.png 1024w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2024\/01\/PDF-Banner-1-768x126.png 768w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2024\/01\/PDF-Banner-1-1536x252.png 1536w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2024\/01\/PDF-Banner-1-2048x337.png 2048w\" sizes=\"auto, (max-width: 2136px) 100vw, 2136px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Typical_case_sampling\"><\/span><b><span data-contrast=\"auto\">Typical case sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Typical case sampling<\/span><span data-contrast=\"auto\"> is a type of <\/span><span data-contrast=\"auto\">purposive sampling in qualitative research<\/span><span data-contrast=\"auto\"> used to choose participants who exemplify typical or average instances of the phenomenon being studied. These selected individuals exhibit behavior and characteristics similar to other participants in the sample. The aim of <\/span><span data-contrast=\"auto\">typical case sampling<\/span><span data-contrast=\"auto\"> is to study typical or normal behavior of the selected individuals to gain comprehensive understanding of the common features linked with the phenomenon. This allows the researcher to identify patterns, themes, or regularities within a certain context.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"_Example-2\"><\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span data-contrast=\"auto\">Example:\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span data-contrast=\"auto\">In a study focused on exploring the experiences of immigrant college students adapting to a new country and university life, the researcher can employ <\/span><span data-contrast=\"auto\">typical case sampling<\/span><span data-contrast=\"auto\">. The students\u2019 experiences can be collected via surveys or interviews to create a dataset of typical immigrant college student experience. Analyzing this dataset provides deeper insights into typical challenges faced by immigrant college students, informing potential adjustments to university policies to create a safer and more comfortable environment for them. It&#8217;s important to note that <\/span><span data-contrast=\"auto\">typical case sampling<\/span><span data-contrast=\"auto\"> is employed to understand a phenomenon rather than to draw generalizations.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Maximum_variation_or_heterogeneous_sampling\"><\/span><b><span data-contrast=\"auto\">Maximum variation (or heterogeneous) sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Maximum variation<\/span><span data-contrast=\"auto\">, also known as <\/span><span data-contrast=\"auto\">heterogeneous sampling<\/span><span data-contrast=\"auto\">, is employed to choose participants with a diverse range of characteristics related to the research question. To put it simply, in this type of purposive sampling, the researcher intentionally chooses participants who display different perspectives to cover a broad range of perspectives. The objective is to capture diverse experiences and situations, facilitating the identification of common patterns and differences within the phenomenon under investigation.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Example\"><\/span><span data-contrast=\"auto\">Example:\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span data-contrast=\"auto\">In examining the influence of career counseling programs on college students&#8217; career development, adopting <\/span><span data-contrast=\"auto\">maximum variation sampling<\/span><span data-contrast=\"auto\"> involves intentionally selecting candidates from various academic streams and different colleges. To enhance diversity, colleges from different locations within the city or state can be chosen. This intentional choice aims to include college students with broad variations, considering different areas and demographics. This sampling approach enables the researcher to attain a comprehensive understanding of the complex and multifaceted topic. Analyzing the collected dataset allows for the identification of patterns, trends, and unique characteristics emerging across the diverse group of participants.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/researcher.life\/all-access-pricing?utm_source=contentmarketing&amp;utm_medium=rblog&amp;utm_campaign=what-is-purposive-sampling-methods-techniques-and-examples-aap-banner-2\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-9685 size-large\" src=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/AAP-Banner-2-1024x410.png\" alt=\"\" width=\"640\" height=\"256\" srcset=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/AAP-Banner-2-1024x410.png 1024w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/AAP-Banner-2-300x120.png 300w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/AAP-Banner-2-768x307.png 768w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/AAP-Banner-2-1536x615.png 1536w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/AAP-Banner-2-2048x820.png 2048w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Extreme_or_deviant_case_sampling\"><\/span><b><span data-contrast=\"auto\">Extreme (or deviant) case sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Extreme case sampling<\/span><span data-contrast=\"auto\"> is performed when there is a need to highlight unusual cases or outliers in the population. The objective of <\/span><span data-contrast=\"auto\">extreme case sampling<\/span><span data-contrast=\"auto\"> is to study instances that significantly deviate from the norm, whether exceptionally successful, unsuccessful, unique, or extreme in other aspects relevant to the research question. Also known as deviant case sampling, this purposive sampling technique is typically utilized to gain insights into the boundaries or limits of a phenomenon and understand the factors influencing such extremes.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Example-2\"><\/span><span data-contrast=\"auto\">Example:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span data-contrast=\"auto\">If a researcher is keen on investigating the impact of educational interventions on academic performance in a school district, an application of <\/span><span data-contrast=\"auto\">extreme case sampling<\/span><span data-contrast=\"auto\"> would involve selecting two schools that represent polar extremes in terms of academic achievement. By choosing schools with either exceptionally high or low academic outcomes, the researcher gains insights into the factors contributing to these extremes within the district. This understanding may unveil unique practices, policies, or contextual factors influencing the variations in academic performance.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Critical_case_sampling\"><\/span><b><span data-contrast=\"auto\">Critical case sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Critical case sampling<\/span><span data-contrast=\"auto\">, a qualitative method, is employed when the researcher deliberately selects samples crucial for the phenomenon under investigation. The goal is to focus on information-rich cases that offer valuable insights into the crucial aspects of the phenomenon. Analyzing critical cases allows the researcher to extrapolate findings to similar cases, making <\/span><span data-contrast=\"auto\">critical case sampling<\/span><span data-contrast=\"auto\"> an initial step in research to determine if further in-depth analysis is warranted.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"_Example-3\"><\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span data-contrast=\"auto\">Example:\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span data-contrast=\"auto\">When studying the effectiveness of a community-based health intervention program aimed at reducing the <a href=\"https:\/\/www.editage.com\/blog\/incidence-prevalence-definitions-differences-examples\/\" target=\"_blank\" rel=\"noopener\">prevalence of a specific health condition<\/a>, a researcher may opt for a <\/span><span data-contrast=\"auto\">critical sampling approach<\/span><span data-contrast=\"auto\">. This involves selecting two types of communities: one where the health program has been successfully implemented and another where the implementation has failed. This sample selection enables the identification of factors contributing to success, as well as barriers and contextual issues hindering implementation. The insights gained can inform future strategies for the health intervention program.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Expert_sampling\"><\/span><strong>Expert sampling\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Expert sampling<\/span><span data-contrast=\"auto\"> is used when the research requires individuals with specific expertise on the topic. Participants are chosen based on demonstrated skills or relevance to the research focus. This method is common in exploratory research, especially when observational evidence is limited.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Example-3\"><\/span><span data-contrast=\"auto\">Example:\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span data-contrast=\"auto\">Imagine a researcher aiming to investigate the influence of emerging technologies on the future of artificial intelligence in healthcare. To gather insights, <\/span><span data-contrast=\"auto\">expert sampling<\/span><span data-contrast=\"auto\"> can be employed to identify individuals with expertise in artificial intelligence, healthcare, and technology. The criteria for selection may include advanced degrees, extensive experience in research or work, and relevant publications in these fields.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Step-by-step_guide_to_purposive_sampling_with_examples\"><\/span><b><span data-contrast=\"none\">Step-by-step guide to <\/span><\/b><b><span data-contrast=\"none\">purposive sampling with examples<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Purposive sampling<\/span><span data-contrast=\"auto\"> becomes crucial in qualitative research aimed at in-depth understanding of a specific phenomenon. Here is a step-by-step guide, including <\/span><span data-contrast=\"auto\">purposive sampling examples<\/span><span data-contrast=\"auto\">, for planning such a study.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"20\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">Define your research question: Begin the <\/span><span data-contrast=\"auto\">purposive sampling<\/span><span data-contrast=\"auto\"> process by clearly defining the specific research question you aim to address. Identify the essential aspects and characteristics you intend to explore in your study, setting the foundation for your research design and methodology. For instance, consider a research problem focused on examining the impact of meditation and sound therapy on enhancing the mental well-being of middle-aged individuals (30-45 years) experiencing free-floating anxiety.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"20\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"auto\">Identify the purpose of sampling: Proceed to identify the goal of your sampling, outlining what you aim to accomplish with your study. Whether it is attaining a comprehensive understanding of a specific subgroup, capturing diverse perspectives, or exploring all relevant characteristics within the population.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"20\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Decide your target population: Specify the population from which your sample will be drawn to gather meaningful conclusions. For instance, in the previously mentioned example focusing on meditation and sound therapy intervention for middle-aged individuals, the target population comprises middle-aged individuals diagnosed with generalized anxiety.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"20\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"4\" data-aria-level=\"1\"><span data-contrast=\"auto\">Determine the criteria for selection: Identify the characteristics, traits, or conditions most pertinent to your research question for the deliberate selection of individuals meeting the criteria. For instance, if your interest lies in studying those individuals who exhibited exceptional responses to meditation and sound therapy, and you seek to understand the reasons behind this, you can choose <\/span><span data-contrast=\"auto\">extreme case sampling<\/span><span data-contrast=\"auto\">, concentrating solely on the best-performing cases.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"20\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"5\" data-aria-level=\"1\"><span data-contrast=\"auto\">Data collection using a well-suited method: Select an appropriate data collection method aligned with your research goal using a <\/span><span data-contrast=\"auto\">purposive sampling method<\/span><span data-contrast=\"auto\">. For example, in the previously mentioned example focusing on meditation and sound therapy intervention, data can be gathered through various means such as interviews, surveys, or observations, involving both the mental health professional conducting the intervention and the participants undergoing the treatment.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"20\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">Result analysis and interpretation: Prior to delving into result analysis, acknowledge the biases that may have emerged due to the intrinsic nature of <\/span><span data-contrast=\"auto\">purposive sampling,<\/span><span data-contrast=\"auto\"> which can introduce potential biases in the methodology. It&#8217;s essential to refrain from generalizing beyond the sampled population.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/paperpal.com\/?utm_source=contentmarketing&amp;utm_medium=r-blog&amp;utm_campaign=heroarticle-what-is-purposive-sampling\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5462 size-full\" src=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/RPaperpal_BlogBanners-1_01_.png\" alt=\"\" width=\"640\" height=\"139\" srcset=\"https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/RPaperpal_BlogBanners-1_01_.png 640w, https:\/\/blog.researcher.life\/wp-content\/uploads\/2023\/03\/RPaperpal_BlogBanners-1_01_-300x65.png 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Advantages_and_disadvantages_of_purposive_sampling\"><\/span><b><span data-contrast=\"none\">Advantages and disadvantages of purposive sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Purposive sampling<\/span><span data-contrast=\"auto\"> finds extensive application in qualitative research; nonetheless, it&#8217;s crucial to consider both the advantages and disadvantages associated with <\/span><span data-contrast=\"auto\">purposive sampling techniques.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Advantages_of_purposive_sampling\"><\/span><b><span data-contrast=\"auto\">Advantages of purposive sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Purposive sampling<\/span><span data-contrast=\"auto\"> has several advantages, some of them are listed here:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"27\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"auto\">With <\/span><span data-contrast=\"auto\">purposive sampling<\/span><span data-contrast=\"auto\"> you can make generalization from the sample being studied compared to a random sample where not all participants might have similar characteristics. However, it is not possible to make statistical inferences from the sample to the population.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"27\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Another significant benefit is the range of <\/span><span data-contrast=\"auto\">purposive sampling methods<\/span><span data-contrast=\"auto\"> available for researchers to choose from based on their research requirements and objectives. Given that qualitative research is often conducted in distinct phases, employing different <\/span><span data-contrast=\"auto\">purposive methods<\/span><span data-contrast=\"auto\"> for each phase enables researchers to build upon the findings of the preceding stage.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"27\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"4\" data-aria-level=\"1\"><span data-contrast=\"auto\">Purposive sampling<\/span><span data-contrast=\"auto\"> is economical and can produce reliable results in real-time.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"27\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"5\" data-aria-level=\"1\"><span data-contrast=\"auto\">Purposive sampling<\/span><span data-contrast=\"auto\"> has less chance of sampling error.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Disadvantages_of_purposive_sampling\"><\/span><b><span data-contrast=\"auto\">Disadvantages of purposive sampling<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Despite the advantages of purposive sampling, there are some drawbacks too.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"28\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"6\" data-aria-level=\"1\"><span data-contrast=\"auto\">Purposive sampling is prone to research bias as the samples are not collected randomly and are based entirely upon the judgement of the researcher leading to the risk of observer bias.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"28\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"7\" data-aria-level=\"1\"><span data-contrast=\"auto\">Generalizations beyond the sampled population is not possible. Hence, no statistical inference can be made.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"28\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"8\" data-aria-level=\"1\"><span data-contrast=\"auto\">Participants&#8217; awareness of their involvement in the research can introduce bias into the study.<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">Purposive sampling<\/span><span data-contrast=\"auto\"> is utilized in situations with smaller population sizes and relies on the accessibility of relevant sample units. Despite this constraint, the intentional selection of participants results in an information-rich sample set. This richness facilitates the extraction of meaningful and relevant insights, potentially guiding future research strategies and interventions.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Guidance_by_Academic_Level\"><\/span>Guidance by Academic Level<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"For_Undergraduate_Students\"><\/span>For Undergraduate Students<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Use purposive sampling for small-scale qualitative projects such as a senior <a href=\"https:\/\/researcher.life\/blog\/article\/thesis-structure-outline-writing-tips\/\">thesis<\/a> or capstone interview study.<\/li>\n<li>Clearly state your selection criteria in <a href=\"https:\/\/www.editage.com\/insights\/how-to-write-the-methods-section-of-a-research-paper\">the methods section<\/a>, even for a small number of participants.<\/li>\n<li>Avoid claiming your findings are generalizable; describe them as illustrative or exploratory instead.<\/li>\n<li>Get instructor or IRB approval before contacting participants, especially for sensitive topics.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"For_Graduate_Students\"><\/span>For Graduate Students<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Justify your sampling strategy with reference to established qualitative methodology literature.<\/li>\n<li>Be explicit about which type of purposive sampling (e.g., maximum variation, criterion) you are using and why.<\/li>\n<li>Discuss data saturation or information power explicitly when justifying your sample size to a thesis or dissertation committee.<\/li>\n<li>Consider <a href=\"https:\/\/researcher.life\/blog\/article\/triangulation-definition-methods-examples\/\">triangulating<\/a> purposive samples with probability samples in a mixed-methods design to strengthen overall study design.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Implementation_Checklist\"><\/span>Implementation Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Write a clear research question and research objectives.<\/li>\n<li>Define and document explicit selection criteria.<\/li>\n<li>Identify gatekeepers or networks to access eligible participants.<\/li>\n<li>Recruit participants and track selection decisions.<\/li>\n<li>Monitor for data saturation during data collection.<\/li>\n<li>Report sampling strategy, criteria, and limitations transparently in the final write-up.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Common_Mistakes_to_Avoid\"><\/span>Common Mistakes to Avoid<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Failing to define selection criteria before recruitment begins.<\/li>\n<li>Overstating generalizability of findings from a purposive sample.<\/li>\n<li>Confusing purposive sampling with convenience sampling (selection should be criteria-driven, not just easy access).<\/li>\n<li>Not documenting why each participant or case was chosen.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_asked_questions\"><\/span><b><span data-contrast=\"none\">Frequently asked questions<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_purposive_sampling_and_convenience_sampling\"><\/span><strong>What is the difference between purposive sampling and convenience sampling?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Purposive sampling<\/span><span data-contrast=\"none\"> and convenience sampling are both employed in qualitative research, but they differ significantly. Convenience sampling involves data collection based on the researcher&#8217;s convenience without necessarily distinguishing participant characteristics. In contrast, <\/span><span data-contrast=\"none\">purposive sampling<\/span><span data-contrast=\"none\"> focuses specifically on selecting participants with characteristics relevant to the research question.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_purposive_sampling_and_random_sampling\"><\/span><strong>What is the difference between purposive sampling and random sampling?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Purposive sampling involves intentional selection based on specific criteria whereas in random sampling participants are selected based on chance selection, where everyone has an equal chance of being selected. Purposive sampling also allows for targeted inclusion, while random sampling aims for unbiased representation.\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_sample_size_for_purposive_sampling\"><\/span><strong>What is the sample size for purposive sampling?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">The sample size for purposive sampling will vary depending upon the research question, specific goals of the study, the nature of the research question, and the in-depth knowledge required. Generally, researchers select participants until they reach a point of saturation, where additional participants do not contribute significantly new information or insights. However, a sample size of 30 individuals is usually deemed as sufficient for qualitative research, while in some cases larger sample sizes are needed. <\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_purpose_of_sampling_in_research\"><\/span><strong>What is the purpose of sampling in research?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><span data-contrast=\"none\">Sampling in research aims to efficiently select a subset of a population for study, making data collection feasible and allowing researchers to draw meaningful conclusions and generalize findings to the larger population.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_principles_of_purposive_sampling\"><\/span><strong>What are the principles of purposive sampling?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Purposive sampling involves intentionally selecting participants based on a purpose, i.e., clear criteria, aligned with research goals, to maximize information richness and gain in-depth insights.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_is_purposive_sampling_conducted\"><\/span><strong>How is purposive sampling conducted?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Purposive sampling is conducted by defining research objectives, establishing criteria, selecting participants intentionally, recruiting participants, collecting and analyzing data, and drawing conclusions in alignment with the study&#8217;s objectives.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_type_of_research_uses_purposive_sampling\"><\/span><strong>What type of research uses purposive sampling?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Qualitative research, such as exploratory research, is usually based on purposive sampling.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_an_example_of_purposive_sampling\"><\/span><strong>What is an example of purposive sampling?\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">An example of purposive sampling is a research study that examines the experiences of female entrepreneurs in the biotechnology industry. Based on the research objectives, the researcher can select female entrepreneurs in the biotechnology industry adding further filters such as age, professional experience, geography, as needed to answer the research question.\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:2,&quot;335559740&quot;:231}\">\u00a0<\/span><\/p>\n<p><strong>This article was originally published on January 30, 2024, and updated on June 16, 2026.<\/strong><\/p>\n<p><i><span data-contrast=\"auto\">R Discovery is a literature search and research reading platform that accelerates your research discovery journey by keeping you updated on the latest, most relevant scholarly content. With 250M+ research articles sourced from trusted aggregators like CrossRef, Unpaywall, PubMed, PubMed Central, Open Alex and top publishing houses like Springer Nature, JAMA, IOP, Taylor &amp; Francis, NEJM, BMJ, Karger, SAGE, Emerald Publishing and more, R Discovery puts a world of research at your fingertips.<\/span><\/i><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559738&quot;:0,&quot;335559739&quot;:240,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p><b><i><span data-contrast=\"auto\">Try R Discovery Prime FREE for 1 week or upgrade at just US$72 a year<\/span><\/i><\/b><i><span data-contrast=\"auto\"> to access premium features that let you listen to research on the go, read in your language, collaborate with peers, auto sync with reference managers, and much more. Choose a simpler, smarter way to find and read research \u2013 <\/span><\/i><b><i><span data-contrast=\"auto\">Download the app and <\/span><\/i><\/b><a href=\"https:\/\/r-discovery.onelink.me\/xKXe\/vgnscmpd\"><b><i><span data-contrast=\"none\">start your free 7-day trial today<\/span><\/i><\/b><\/a><b><i><span data-contrast=\"auto\">!<\/span><\/i><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559738&quot;:0,&quot;335559739&quot;:240,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Glossary of Key Terms Term Definition Purposive Sampling A non-probability technique where the researcher deliberately selects participants or cases based on specific traits relevant to<\/p>\n","protected":false},"author":41,"featured_media":7706,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","footnotes":""},"categories":[37,487,63],"tags":[731,690,694,693],"class_list":["post-7703","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-r-discovery","category-research-reading","category-research-tips","tag-purposive-sampling","tag-sampling-methods","tag-sampling-techniques-in-research","tag-types-of-sampling-methods"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Purposive Sampling? 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