There are two things you can do here. One is to create your own design matrix in a text file and pass it to mri_glmfit with the --X (instead of using an fsgd file). If you want to stay with the fsgd, then you can spec DODS (this will set up one regressor for MMSE instead of two).

doug

Martin Kavec wrote:

Hi,

I am trying to run a group analysis on cortical thickness between patients and controls. In the qdec.dat I set a MMSE for all the controls 0.0. Now, whenever I try to covariate thickness against age and MMSE, the qdec complains that there is no spectrum in MMSE values. I tried to set MMSE for one of controls to 0.1 and the analysis goes fine. After thinking for a while, I started to wonder whether I shouldn't calculate thickness difference first, but I am not finding the receipt on the web anymore.

Thanks in advance,

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