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The Kruskall-Wallis test is a non-parametric alternative to one-way (between-groups) ANOVA. It is used to compare three or more samples, and it tests the null hypothesis that the different samples in the comparison were drawn from the same distribution or from distributions with the same median. Thus, the interpretation of the Kruskall-Wallis test is basically similar to that of the parametric one-way ANOVA, except that it is based on ranks rather than means. For more details, see Siegel & Castellan, 1988. See also, Nonparametric Statistics.
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