
{"id":4321,"date":"2023-09-04T12:28:36","date_gmt":"2023-09-04T12:28:36","guid":{"rendered":"https:\/\/www.editage.com\/insights\/an-introduction-to-non-parametric-tests-for-biomedical-researchers\/"},"modified":"2025-01-15T06:16:31","modified_gmt":"2025-01-15T06:16:31","slug":"an-introduction-to-non-parametric-tests-for-biomedical-researchers","status":"publish","type":"post","link":"https:\/\/www.editage.com\/insights\/an-introduction-to-non-parametric-tests-for-biomedical-researchers","title":{"rendered":"An introduction to non-parametric tests for biomedical researchers"},"content":{"rendered":"<p paraeid=\"{a4ce3681-b4ed-4c53-b429-b792ab8032fe}{172}\" paraid=\"1866095500\">Statistical analysis is an integral part of biomedical research, but it\u2019s often difficult to choose the right test to run. If you\u2019ve ever encountered puzzling <a href=\"https:\/\/www.editage.com\/insights\/top-qas-from-the-recent-editage-webinar-on-describing-and-understanding-data-distributions?refer=insights-search-posts\" rel=\"noreferrer noopener\" target=\"_blank\">data distributions<\/a> or outliers that just won\u2019t behave, worry not! Non-parametric tests are your allies in such situations: they come to the rescue when your data isn\u2019t playing by the rules of popular tests like t tests or <a href=\"https:\/\/www.editage.com\/blog\/anova-types-uses-assumptions-a-quick-guide-for-biomedical-researchers\/\" rel=\"noreferrer noopener\" target=\"_blank\">ANOVAs<\/a>. In this guide, we\u2019ll delve into when and how to use these tests effectively, armed with examples from biomedical research.&nbsp;<\/p>\n<p paraeid=\"{a4ce3681-b4ed-4c53-b429-b792ab8032fe}{222}\" paraid=\"511076258\"><strong><span style=\"color:#2980b9;\"><span style=\"font-family:Trebuchet MS,Helvetica,sans-serif;\">Advantages and Limitations of Non-Parametric Tests&nbsp;<\/span><\/span><\/strong><\/p>\n<p paraeid=\"{a4ce3681-b4ed-4c53-b429-b792ab8032fe}{232}\" paraid=\"2018719324\">Non-parametric tests are <a href=\"https:\/\/www.editage.com\/insights\/3-simple-steps-to-help-you-pick-the-right-statistical-test?refer=insights-search-posts\" rel=\"noreferrer noopener\" target=\"_blank\">flexible and robust<\/a>, which makes them great for dealing with real-world, messy data. They don\u2019t demand stringent assumptions, making them versatile tools in your <a href=\"https:\/\/www.editage.com\/blog\/guide-to-types-of-inferential-statistics-for-biomedical-researchers\/\" rel=\"noreferrer noopener\" target=\"_blank\">statistical toolkit<\/a>. However, they might be slightly less powerful than their parametric counterparts when your data is normally distributed and assumptions are met. Let\u2019s look at the most popular non-parametric tests in biomedical research.&nbsp;&nbsp;<\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{7}\" paraid=\"293040719\"><strong><span style=\"color:#2980b9;\"><span style=\"font-family:Trebuchet MS,Helvetica,sans-serif;\">Mann-Whitney U Test: A Friend to Ordinal Data&nbsp;<\/span><\/span><\/strong><\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{17}\" paraid=\"653562909\">Imagine you\u2019re investigating levels of a specific clinical biomarker, NGAL, in people with and without with chronic kidney disease. When you collect the data, NGAL levels follow a skewed distribution. Here, the Mann-Whitney U test rides in on a white horse. It helps you compare these two groups without the need for a normal distribution, making it ideal for situations like these.&nbsp;<\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{75}\" paraid=\"1072947585\"><strong><span style=\"color:#2980b9;\"><span style=\"font-family:Trebuchet MS,Helvetica,sans-serif;\">Wilcoxon Signed-Rank Test: A Pair-Wise Pal&nbsp;<\/span><\/span><\/strong><\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{85}\" paraid=\"1931699117\">Say you\u2019re researching the impact of a dietary intervention on cholesterol levels. You have before-and-after measurements for each participant. Again, like in the earlier example, the data doesn\u2019t follow a normal distribution, but the data are paired (i.e., related). No worries! The Wilcoxon Signed-Rank Test is designed for non-normally distributed paired data. It helps you determine whether the intervention led to a significant change, without the need for that pesky normality assumption.&nbsp;<\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{143}\" paraid=\"531718539\"><strong><span style=\"font-family:Trebuchet MS,Helvetica,sans-serif;\"><span style=\"color:#2980b9;\">Kruskal Wallis Test: Exploring Beyond Two Groups&nbsp;<\/span><\/span><\/strong><\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{151}\" paraid=\"681532252\">What if you\u2019re dealing with more than two groups? That\u2019s where the Kruskal-Wallis test comes into play. Imagine you\u2019re analyzing pain scores after three different treatments. If the scores aren\u2019t normally distributed, the Kruskal-Wallis test steps up to help you figure out if there\u2019s a significant difference among the treatments.&nbsp;<\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{193}\" paraid=\"75540691\"><strong><span style=\"font-family:Trebuchet MS,Helvetica,sans-serif;\"><span style=\"color:#2980b9;\">Time for Group Dynamics: Friedman\u2019s ANOVA&nbsp;<\/span><\/span><\/strong><\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{207}\" paraid=\"1772000604\">Now, picture a study where you\u2019re tracking blood pressure levels of patients across three time points. The data isn\u2019t quite fitting the normal mold, but Friedman\u2019s ANOVA is your solution. This test allows you to determine if there\u2019s a significant difference in blood pressure over time without assuming a normal distribution.&nbsp;<\/p>\n<p paraeid=\"{0ba3c755-840c-490a-b602-b80cfeea2680}{243}\" paraid=\"64277519\"><strong><span style=\"font-family:Trebuchet MS,Helvetica,sans-serif;\"><span style=\"color:#2980b9;\">Spearman\u2019s Rho and Kendall\u2019s Tau: Examining Relationships&nbsp;<\/span><\/span><\/strong><\/p>\n<p paraeid=\"{55cd1f6f-d9a7-4db0-b03f-1c373a1519ef}{12}\" paraid=\"149829466\">Non-parametric tests also can be used to explore <a href=\"https:\/\/www.editage.com\/insights\/differences-between-correlation-and-regression-learn-about-different-types-of-statistical-relationships?refer=insights-search-posts\" rel=\"noreferrer noopener\" target=\"_blank\">relationships between variables<\/a>. Spearman\u2019s rho is a good choice when you\u2019re testing for correlations among ranked data. For instance, you could be assessing the correlation between ranked pain perception scores and genetic expression levels to explore genetic factors related to pain sensitivity.&nbsp;&nbsp;<\/p>\n<p paraeid=\"{55cd1f6f-d9a7-4db0-b03f-1c373a1519ef}{57}\" paraid=\"523008851\">On the other hand, Kendall\u2019s tau helps you uncover whether the variables tend to move together in a consistent order, regardless of the specific values involved. It\u2019s particularly handy when you have data where the order of values matters more than the specific numerical differences between them. Suppose you\u2019re trying to understand patient preferences for different treatment methods for chronic pain. You ask patients to rank the effectiveness of three treatment options: medication, physical therapy, and acupuncture. By applying Kendall\u2019s Tau, you can analyze the relationships between patients\u2019 rankings of the treatments: do patients who rank one treatment method higher tend to rank the other treatments higher as well? Or do patients have distinct and opposite preferences for different treatment methods?&nbsp;<\/p>\n<p paraeid=\"{55cd1f6f-d9a7-4db0-b03f-1c373a1519ef}{125}\" paraid=\"271853411\"><strong><span style=\"font-family:Trebuchet MS,Helvetica,sans-serif;\"><span style=\"color:#2980b9;\">Conclusion&nbsp;<\/span><\/span><\/strong><\/p>\n<p paraeid=\"{55cd1f6f-d9a7-4db0-b03f-1c373a1519ef}{135}\" paraid=\"358326950\">From wrangling ordinal data to handling outliers, non-parametric tests offer a robust alternative to traditional methods. Whether you\u2019re <a href=\"https:\/\/www.editage.com\/insights\/whats-the-best-way-to-check-for-differences-between-groups-t-test-chi-square-test-or-anova-a-quick-and-simple-guide?refer=insights-search-posts\" rel=\"noreferrer noopener\" target=\"_blank\">diving into comparisons<\/a>, exploring group dynamics, or teasing out <a href=\"https:\/\/www.editage.com\/insights\/best-practices-in-reporting-correlations-associations-and-regressions-in-biomedical-research?refer=insights-search-posts\" rel=\"noreferrer noopener\" target=\"_blank\">relationships<\/a>, non-parametric tests have your back. So, arm yourself with these tools and venture forth into your <a href=\"https:\/\/www.editage.com\/blog\/decoding-statistical-data-for-accurate-insights\/\" rel=\"noreferrer noopener\" target=\"_blank\">data analysis adventures<\/a> with confidence!&nbsp;<\/p>\n<p paraeid=\"{55cd1f6f-d9a7-4db0-b03f-1c373a1519ef}{135}\" paraid=\"358326950\">&nbsp;<\/p>\n<p paraeid=\"{55cd1f6f-d9a7-4db0-b03f-1c373a1519ef}{160}\" paraid=\"665576525\"><em>Get expert advice on choosing and running the right statistical test for your data and research question. Check out Editage\u2019s <a href=\"https:\/\/www.editage.com\/services\/publishing-services-packs\/statistical-analysis\" rel=\"noreferrer noopener\" target=\"_blank\">Statistical Analysis &amp; Review Services<\/a>.&nbsp;<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Statistical analysis is an integral part of biomedical research, but it\u2019s often difficult to choose the right test to run. If you\u2019ve ever encountered puzzling data distributions or outliers that just won\u2019t behave, worry not! Non-parametric tests are your allies in such situations: they come to the rescue when your data isn\u2019t playing by the [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":33313,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2420],"tags":[2622,288,1319,2778],"new_categories":[],"new_tags":[],"series":[],"class_list":["post-4321","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-analysis","tag-analysisofdata","tag-data-management","tag-statistical-analysis","tag-statistical-analysis-and-review"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>By following a style guide, authors can make their work easier to read and understand. 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