Non-parametric Tests
Non-parametric tests in R — Wilcoxon / Mann-Whitney for two groups, Kruskal-Wallis for three or more, and the signed-rank test for paired data.
Compare groups without assuming a normal distribution — rank-based tests.
Run the code
Everything in the video — edit it and press Run Code to run real R right here, or copy it:
Download this R script · ▶ Open the full playground
When to use it. Reach for these when normality is doubtful or the sample is small: Mann-Whitney (2 independent groups), Kruskal-Wallis (3+ groups), Wilcoxon signed-rank (paired).