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Introduction When? Data How? Combine statistical test and plot References Introduction In a previous article, we showed how to do a two-sample Wilcoxon test in R. Remember that there are actually two versions of this test: The Mann-Whitney-Wilcoxon test (also referred as Wilcoxon rank sum test or Mann-Whitney U test), used to compare two independent samples. This test is the non-parametric version of the Student’s t-test for independent samples....