The Kruskal-Wallis test is a nonparametric statistical method used to determine if there are statistically significant differences between two or more independent groups based on their ranks. This test is particularly useful when the assumptions of ANOVA cannot be met, such as when the data is not normally distributed or when the sample sizes are small. It extends the Wilcoxon rank-sum test to more than two groups, making it a powerful tool for comparing multiple sets of ranked data.
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