alpha diversity group significance (Kruskal-wallis)：2+groups？

[YuZhang]

sorry， I’m not sure what you mean.
And I also want know. If the data is normal distribution,I should select ANOVA, if it is not, I should select KW,isnt it?

Kruskal-Wallis test of alpha diversity

Hi @kiara! Kruskal-Wallis can be applied to two or more groups, so it can be applied in a pairwise manner (i.e. comparing two groups at a time), or to all groups simultaneously. alpha-group-significance uses the Kruskal-Wallis test for both “all groups” and “pairwise” tests. Kruskal-Wallis is a non-parametric version of the one-way ANOVA test. Just as ANOVA can be applied to 2+ groups and is a generalization of the t-test (which works with 2 groups only), Kruskal-Wallis can be applied to 2+ g…

Now, I have 4 groups samples, and each has 3 subgroups. And I want compare 3 subgroups difference in a group, so run the
Test of Homogeneity of Variances in SPSS, I find a group isnt normal normal distribution but other 3 group is . So, do I choose KW for the sake of uniformity? or 3 groups use ANOVA ,and the rest one use KW?