Friedman's rank test for k-related samples is to Wilcoxon's matched-pairs signed ranks test as a repeated-measures ANOVA is to a paired samples t-test.

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Both of these pairs of statistical tests are analogous in that they represent more powerful alternatives to simpler tests when the assumption of independence between samples is violated. The Friedman's rank test is an extension of the Wilcoxon signed-ranks test to more than two related samples. Similarly, repeated measures ANOVA is used when there are three or more related samples, and it is more powerful than the paired samples t-test, which is used for only two related samples.

Friedman's Rank Test for K-Related Samples Is to Wilcoxon's Matched-Pairs