afni.nimh.nih.gov

Christy,

Intuitively you can only make some generalization based on the information from each individual subject. Regardless what program you use, you can only use those subjects who have all the beta's available for a specific weighted contrast. For example, with 2*cond1 -1*cond5 -1*cond7, a group analysis can be performed only on those subjects with beta available for cond1, cond5 and cond7.

Gang