Hello FreeSurfer Group
I would like to make a two group comparison controlling for both gender and medication status. The only way that I have sorted out doing this is to make eight groups (ClinicalGroup x Sex x Meds) but I get an error that my design is poorly scaled:
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ERROR: matrix is ill-conditioned or badly scaled, condno = 1e+08
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Possible problem with experimental design:
Check for duplicate entries and/or lack of range of
continuous variables within a class.
If you seek help with this problem, make sure to send:
1. Your command line:
mri_glmfit --y lh.lgi.mgh --fsgd FSGD_GroupSexTP_AntiPsych.txt --glmdir lh.lgi.glmdir --surf average lh --C contrast.txt
2. The FSGD file (if using one)
3. And the design matrix above