[R] kruskalmc, significant differences while median values are the same

[Pascal Oettli]

Hello,

What about the median ranks? This test is based on ranks.

Regards,
Pascal


Le 12/12/15 18:04, Omphalodes Verna a écrit :
> Dear list!
>
> I work with multiple Kruskal-Wallis test (kruskalmc, package pgirmess), which evaluates differences in medians among groups (5 groups). A result of a test is significant differences among some groups, while median values are the same for 4 groups (using tapply). Why?
>
> p.s.: number of samples in groups vary from 50 to 4900.
>
> Thanks to all, OV
>
> .
>
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