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Dear freesurfer experts,

I would like to replicate an analysis I did with qdec but regressing out thickness at the vertex level. It’s a myelin group contrast with age and left average myelin as nuisance factors.

I used the mri_glmfit command line generated during that qdec analysis and added the pvr flag but I got that error message:

ERROR: dimension mismatch between X and contrast /home/damien/bin/freesurfer6/subjects/qdec/10nov/contrasts/lh-Avg-Intercept-R1projfrac0.5.mat X has 7 cols, C has 6 cols

How can I solve that, should I modify the contrast.mat?

Many thanks,

Damien

mri_glmfit --y /home/damien/bin/freesurfer6/subjects/qdec/10nov/y.mgh --fsgd /home/damien/bin/freesurfer6/subjects/qdec/10nov/qdec.fsgd dods --glmdir /home/damien/bin/freesurfer6/subjects/qdec/10nov --surf fsaverage lh --label /home/damien/bin/freesurfer6/subjects/fsaverage/label/lh.aparc.label --C /home/damien/bin/freesurfer6/subjects/qdec/10nov/contrasts/lh-Avg-Intercept-R1projfrac0.5.mat --C /home/damien/bin/freesurfer6/subjects/qdec/10nov/contrasts/lh-Diff-ct-dys-Intercept-R1projfrac0.5.mat --pvr lh.thicknessall.fsaverage.mgh