kruskalwallis test, mean or median?

Hello,

Does kruskalwallis test difference of the MEAN or MEDIAN between 2 groups?

Which should I use, mean or median?

Why?

Thank you.

Answer 1

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From the documentation section More About:

• The Kruskal-Wallis test is a nonparametric version of classical one-way ANOVA, and an extension of the Wilcoxon rank sum test to more than two groups. It compares the medians of the groups of data in x to determine if the samples come from the same population (or, equivalently, from different populations with the same distribution).

(Underline added.)