Hello Freesurfers,
I have a problem with mri_glmfit. I performed the 
analysis on two FA data. 
My fsgd is:
GroupDescriptorFile 1
Title 
SUBJ_FA
Class PRE
Class POST
Input FA_1 PRE
Input FA_2 POST


group_difference.mtx:
1 -1

The results in cmd line
DOF = 0
ERROR: DOF 
= 0

What does it mean this error? 

Thank you for your help.
Matteo


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