Hi Freesurfer Experts,

 

In my design i want to use a general linear model tot relate cognitive performance and cortical thickness. I want to control for age, total gray matter, gender and education.  I have two discrete variables, including gender (0,1) and Education (1-7). The problem is that the discrete variables do not appear in the nuisance screen in qdec. How can i control for this discrete variables? Can i put these variables in the nuisance screen? Or should i remove the gender.levels and education.levels file? Just highlighting the two variables gender and age result in an error in analyze: command failed: mri_glmfit --y 

 

In the qdec screen. When i just highlight gender and education in the discrete screen, highlight cogitive_performance in the continous screen, and Age and Total_gray  in the nuisance screen. Analysing gives a error.

 

But when i highlight only cognitive_performance in the continuous screen and nuisance factors age and total_gray in the nuisance screet. It work very well. And a vertex-wise cluster analyses can be done.

 

Thanks,

Stan