The Friedman test is the nonparametric counterpart to the randomized block design of the analysis of variance.

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The Friedman test is a nonparametric statistical test that is used to compare the median value of two or more groups. It is similar in concept to the randomized block design of the analysis of variance (ANOVA) but does not require the assumptions of normality and equal variance.

The Friedman Test Is the Nonparametric Counterpart to the Randomized