Omnibus Test The Kruskal-Wallis H test is a non-parametric test that is used in place of a one-way ANOVA. Essentially it is an extension of the Wilcoxon Rank-Sum test to more than two independent samples. Although, as explained in Assumptions for ANOVA, one-way ANOVA is usually quite robust, there are many situations where the assumptions … Continue reading Kruskal-Wallis Test