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Friedman

The Friedman test: do several treatments differ, measured on the same subjects?

What Wilcoxon is to MannWhitney, this is to KruskalWallis: the same rank-based comparison of several groups, but with the groups measured on one set of subjects rather than on independent ones. Each subject is ranked against itself, which removes whatever made that subject high or low to begin with — the reason it sees differences a between-subjects test would lose in the noise.

Members

Member	What it does
Friedman.Test	Compares three or more treatments measured on the same blocks.