Tests include the MannWhitney test for 2 independent samples, Kruskal-Wallis test for k independent samples, Wilcoxon Signed Ranks test, and Friedman test.
The Friedman test is an extension of the sign test for several independent samples. It is a test for treatment differences in a randomized, complete block design. Additional statistics provided are Kendall’s Coefficient of Concordance (W) and Spearman’s Rho.