Kruskal-Wallis test

The Kruskal-Wallis test is a statistical method used to compare three or more groups to see if there are differences in their medians. Think of it as a way to determine if different groups, like various treatments in a study, produce different results without assuming the data follows a specific distribution. Instead of looking just at averages, it ranks all data points from lowest to highest and checks if the ranks differ significantly among the groups. If they do, it suggests that at least one group is different from the others in terms of the outcome being measured.