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Hi Doug,

Recently I started working on freesurfer for volume based analysis. For QDEC, I need to include more than 2 variables. For example if I include patients who hail from different places like statutory town, census town and rural. In present scenario, can I include all three as covariates.  

Here is the error that qdec showing while running GLM:

"ERROR: Subject 2 seems to have a mismatched number of discrete factors (expected 4, found 1)"

"Reading source surface /usr/local/freesurfer/subjects/fsaverage/surf/lh.white

ERROR: no contrasts specified."

"Error in Analyze: command fai;ed mri_glmfit --y

/usr/local/freesurfer/subjects/qdec/qdecAnalys/y.mgh --fsgd

/usr/local/freesurfer/subjects/qdec/qdecAnalys/qdec.fsgd dods -glmdir

/usr/local/freesurfer/subjects/qdec/qdecAnalys/ -surf fsaverage lh -label

/usr/local/freesurfer/subjects/fsaverage/label/lh.aparc.label"

Could you help us out in this regard.

Would appreciate any help!!

Korann

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