# Comparing means between several groups

I have 3 variables that are divided into 4 groups (Quantitative variables).

I intend to check if there is any difference between the groups for each variable.

My difficulty in using ANOVA - it indicates that one of the group is different but it does not indicate which one of the group is different.

Can you please advise what kind of test to use in order to get an indication of which group is different in relation to the others. Should I use a T-TEST in the following way: checking one group in relation to the other 3 groups together (=as another one group)?

• With only four groups. I would start with graphical methods, like a side-by-side boxplot. There are other ideas for graphical anova, on CRAN there is a package granova for this. – kjetil b halvorsen Mar 30 '17 at 14:36

Then you can test that none of $k$=4 groups stochastically dominates one another.