afni.nimh.nih.gov

> -glfLabel 1 group_Lthickness -glfCode 1 'Group : 1*HC -1*PAT1 & 1*HC -1*PAT2 & 1*PAT1 -1*PAT2' \

I'm not so sure why 3dMVM threw that error. Do you have only three groups? If so, 3dMVM should automatically give you an F-test in the output.

Gang