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Hi,
I would like to replicate an analysis I did with qdec but regressing out thickness at the vertex level. It’s a myelin group difference 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
I understood I had to change the contrast.mat and added a 0 at the end for the pvr: +1.00000 -1.00000 +0.00000 +0.00000 +0.00000 +0.00000 +0.00000
Can you please tell me if it is correct??? I would like to be sure.
I see more or less the same results than before except that some clusters are a bit degraded let say, as if I was working with a lower level of smoothing.
Damien