Kruskal Wallis Test Hypothesis. Is there a difference between groups 1 2 and 3 using alpha 0 05. It is sometimes referred to as one way anova on ranks.
It extends the mann whitney u test which is used for comparing only two groups. A significant kruskal wallis test indicates. It is a nonparametric test.
The null hypothesis of the kruskal wallis test is often said to be that the medians of the groups are equal but this is only true if you assume that the shape of the distribution in each group is the same.
Ordinal data is displayed in the table below. The kruskal wallis test is a version of the independent measures one way anova that can be performed on ordinal ranked data. It extends the mann whitney u test which is used for comparing only two groups. Although this test is for identical populations it is designed to be sensitive to unequal means.
