Dear Jesper and Andreas,
Thank you very much for your comments. I think Jesper's explanation will be very useful, and I will try to use 'randomise' to analyse my results. I have seen that it is not the ideal tool to perform repeated measures (what seems to be my case, since I have a group of 17 subjects with 3 different treatments, and I would like to compare these treatments), but I saw that there are different options to accommodate this issue.
Again, thanks a lot!
Javier
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