Nonparametric statistics is the branch of statistics that is not based solely on parametrized families of probability distributions. Nonparametric statistics is based on either being distribution-free or having a specified distribution but with the distribution's parameters unspecified. Nonparametric statistics includes both descriptive statistics and statistical inference.
Mann-Whitney U-test
Wilcoxon signed-rank test
Kruskal-Wallis test
Friedman test
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