The non-parametric Wilcoxon-Mann-Whitney test (a.k.a. Mann–Whitney U test, Wilcoxon rank-sum test) tests if two independent samples, with ordinal attributes, originate from populations with the same distribution.
More information can be found at Wilcoxon-Mann-Whitney test on Wikipedia.
H0: the distributions of the populations are the same.
HA: the distributions of the populations are different.
Double.NaNvalues are treated.
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