In statistics, the Mann–Whitney ``U`` test (also called the Mann–Whitney–Wilcoxon (MWW), Wilcoxon rank-sum test, or Wilcoxon–Mann–Whitney test) is a nonparametric test of the null hypothesis that two populations are the same against an alternative hypothesis, especially that a particular population tends to have larger values than th...
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A non-parametric test proposed by Wilcoxon for comparing two population distributions by first ordering the combined observations from the samples selected from each population and then summing the ranks of the observations from the samples. The Mann-Whitney U test uses a function of the rank sums as its test statistic.
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