Hi John, they should line up. Technically, if you're just doing an OSGM (one-sample group mean), then the order is not important. But it you want to compare across groups, you need to make sure that the group memberships are properly assigned.

doug

On 6/23/11 5:05 PM, John Richey wrote:

Dear freesurfer experts,

I have a simple question about the use of isxconcat-sess.

I plan to conduct a between-groups analysis later (using mri_glmfit), but as I am creating my osgm using isxconcat-sess, is it is necessary for the text file list of subjects (indicated by -sf) to match the order of subjects in my .fsgd file? Of course the .fsgd file will contain information about the group membership, but I wasn't sure if the order of subj had to line up in both files, nevertheless.

Many thanks! _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer