Thank you very much Donald for your promptly answer.
Yes, in my model each column has 1s and 0s indicating the group membership. And what I understand then is that there is not any problem with the non-orthogonality here, am I right? Please, I need to be sure with this matter.
About the correction for multiple comparisons in the post hoc analyses thank you very much, the answer is very clear.
Thanks again
Daniel
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