Dear all,
I'm relatively new with Freesurfer, but slowly getting more and more used to it's great possibilities. To be 'sure', I've a question about the design of a GLM. I want to compare CT in Healthy Controls vs Diseased, and control for age and sex. It appears to me that factors (eg sex) cannot be used as covariate/variable, which forces me to model them as a separate class although I'm not interested in sex differences. This brings me to the following FSGD file: # HcDis.fsgd GroupDescriptorFile 1 Title HcDis Class Hc_Male Class Hc_Female Class Dis_Male Class Dis_Female Variables Age Input subjid1 Hc_Male 35 Input subjid2 Dis_Female 30 .. Then the difference between Hc and Dis, corrected for age and sex is given by the contrast matrix #Hc-vs-Dis.mtx 0.5 0.5 -0.5 -0.5 0 0 0 0 0 0 0 0 Is this correct? Best, Martijn
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