[R] Question regarding Kruskal-Wallis test

syrvn mentor_ at gmx.net
Tue Nov 15 12:33:21 CET 2011


I need to analyse an experiment with 3 groups:

Control group
Treated group 1 (drug 1)
Treated group 2 (drug 2)

If I use a Kruskal-Wallis test do analyse the data and if I define the
control group as the reference group does the test do then the following

Control group vs. Treated group 1
Control group vs. Treated group 2
Treated group 1 vs. Treated group 2

I am not sure about whether the last comparison is made by the test or not?
What happens if I have 4 different groups? Are there then all possible
combinations compared?


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