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Thank you very much! That makes a lot of sense. However, when I tried to run the analysis using that contrast (0.5 0.5 -0.5 -0.5 0), the following error appears:
dimension mismatch between X and contrast Contrasts/age_sim.mtx X has 4 cols, C has 5 cols
My fsgd file contains the following info:
Title CMTX
Class patientmale Class patientfemale Class controlmale Class controlfemale
Variables age
Any ideas of how to resolve it?
Thanks once again, Georgina