Hi there FreeSurfer

When trying the GLM-analysis I keep getting the following error. Could you help me with fixing it?

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.whiplash.thickness.10B.mgh --fsgd whiplash.fsgd dods --C group_diff.mtx --surf fsaverage lh --cortex --glmdir lh.whiplash.glmdir 

  2. The FSGD file (if using one)

  3. And the design matrix above

Thank you in advance,

Robby