23 Nov
2012
23 Nov
'12
2:01 a.m.
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