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Hi Freesurfer experts, 

Here, I want to design a simple group comparison (two levels: Case vs. Control) and also count for 4 covariates (two continuous and two categoricals). However, the GLM model cannot recognize my discrete variables. What do you suggest to change?

>> FSDG file:

GroupDescriptorFile 1

Title MyStudy

Class Control

Class Case

Variables age gender race  eTIV

Input sub001_base Control 85 Female White 1350519

Contrast:

>> Design matrix for Case-Control and regress out the effect of age, gender, race, and eTIV. 

-1 1 0 0 0 0 0 0 0 0 

Best, 

Zeng

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