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Posts Research About When R’s Mann-Whitney U-test returns extremely distorted p-values Date April 25, 2023 Tags Mathematics Statistics Research Mann-Whitney U-test R The Mann–Whitney U test (also known as the Wilcoxon rank-sum test) is one of the most popular nonparametric statistical tests. In R, it can be accessed using the wilcox.test function, which has been available since R 1.0.0 (February 2000). With its extensive adoption and long-standing presence in R, the wilcox.test function has become a trusted tool for many researchers. But is it truly reliable, and to what extent can we rely on its accuracy by default? In my work, I often encounter the task of comparing a large sample (e.g., of size 50+) with a small sample (e.g., of size 5). In some cases, the ranges of these samples do not overlap with each other, which is the extreme case of the Mann–Whitney U test: it gives the minimum possible p-value. In one of the previous posts , I presented the exact equation for such a |
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