After I done analyzing three groups in Kruskal Wallis (One way ANOVA in non-parametric-more than two groups), if there is statistical significant difference, you have to use next test. Either Mann-Whitney or Post-hoc test. To evaluate the outcomes within the groups. Likewise, group A, B and C was statistically significant different (P<0.05). The different effect when comparing A-B, B-C and A-C? We dont know. Yet, Mann-Whitney or Post-hoc test are the next.
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