What Is The Difference Between Mann Whitney And Kruskal Wallis. I think calling the KruskalWallis test an ANOVA is confusing and I recommend that you just call it the KruskalWallis test. Consider MannWhitney test for just two groups instead of KruskalWallis test.
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The ANOVA and t-test is explicitly a test of equality of means of values. But they work very differently. The Kruskal-Wallis One-Way ANOVA can be used to compare three or more groups on your variable of interest.
There are differences in the assumptions and the hypotheses that are tested.
It is incorrect to perform separate Mann-Whitney test because you increase the risk to commit a type 1 error ie probability of rejecting a true null hypothesis. Mann-Whitney test is not just a test of medians. The ANOVA and t-test is explicitly a test of equality of means of values. Jan 01 2009 The Kruskal-Wallis test is the corresponding nonparametric test for comparing three or more groups.
