Dear FS experts， I have two group and two times to do longitudinal cross analysis. I looked your answer in https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg45870.html and https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg52032.html Sorry, I can’t understand what you said” you can either subtract the two time points and then do a regular group analysis” " subtract tp1 from tp2 manually and pass the result to mri_glmfit."
How to subtract the two time manually and how to do then ? Would you please tell me more details? And in my analysis, if I use the paired analysis, how to design paired.fsgd and paired-diff.fsgd? In http://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis I am sorry to only see how to do in one group. Looking forward to reply, and thanks very much. Kind regards, Livia
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