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kruskalmc, significant differences while median values are the same

Omphalodes Verna 
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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Thread (4 messages)

Omphalodes Verna kruskalmc, significant differences while median values are the same Dec 15 Pascal Oettli kruskalmc, significant differences while median values are the same Dec 15 Thomas Lumley kruskalmc, significant differences while median values are the same Dec 16 Omphalodes Verna kruskalmc, significant differences while median values are the same Dec 16