[R] Kruskal-Wallis test and kruskalmc

KEL karenelainelamb at gmail.com
Wed Oct 28 14:27:34 CET 2009

Dear all,

I am using the Kruskal-Wallis test in R (kruskal.test()) to compare
non-normally distributed observations for 5 different groups. I now want to
perform multiple comparisons to identify the groups with significant
differences in the mean ranks. On searching the forum I found a number of
suggestions of approaches to try and decided to use kruskalmc() from the
pgirmess package. However, I appear to get contradicting results as I have a
significant p-value of 0.0007 from the Kruskal-Wallis test indicating a
difference between at least two groups but no apparent differences in the 5
groups. Why is this the case? Apologies for my ignorance if there is an
obvious answer to this question!

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