Hello, FreeSurfer group,
When I ran glmfit I got the following error massage. I standardize ages but the problem remains. Any other suggestions? Alternatively, is there any way to by-pass this design checking step?
Thank you very much.
Xin
-------------------------------- ERROR: matrix is ill-conditioned or badly scaled, condno = 1e+08 -------------------------------- 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.bin --y RESULT/group_currPTSD_AgeGenderSiteFACT_adult/lh_group_currPTSD_AgeGenderSiteFACT_adult.fwhm10.fsaverage.mgh --fsgd group_currPTSD_AgeGenderSiteFACT_adult.fsgd dods --glmdir RESULT/group_currPTSD_AgeGenderSiteFACT_adult/lh --surf fsaverage/ lh --C group_currPTSD_AgeGenderSiteFACT_adult.mtx 2. The FSGD file (if using one) 3. And the design matrix above Attempting to diagnose further SumSq: Min=0.330000 (col 38), Max=18.703472 (col 62) The scale is much different between columns 38 and 62, you may want to normalize by subtracting the mean and dividing by the standard deviation. ERROR: cannot find RESULT/group_currPTSD_AgeGenderSiteFACT_adult/lh/fwhm.dat