The Wilcoxon rank sum test tests for the equality of means of two populations, or whether the means differ by an offset.
Compute the exact distribution of the Wilcoxon rank sum test statistic.
The Wilcoxon signed rank test tests, for the one-sample case, the median of the distribution against a hypothetical median, and for the two-sample case, the equality of medians of groups.
Compute the exact distribution of the Wilcoxon signed rank test statistic.
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