Dear FreeSurfers: I hope you can help me out with a problem in disgning my .mtx file. I want to examine the difference among three groups (HC group, EX group and PT group). Considing gender, I have six groups as similar as the example described inhttp://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf6G0V. But I want to correct for age. Then, I have 6 classes (two factors/three levels) and one covariate (age). How can I compare the difference among three groups (HC group, EX group, and PT group)? Could you please tall me how to design the contrast matrix with 12 regressors?
Thanks a zillion times! Best wishes shiguangli
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