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Dear FreeSurfer experts
I ran QDEC and got the following error.
Design matrix ------------------
1.00000 1.04000 -1.38574 2.00000 29.00000 19.00000;
1.00000 1.04000 -0.55066 2.00000 35.00000 19.00000;
1.00000 1.03000 2.31721 2.00000 23.00000 14.00000;
1.00000 1.03000 -0.22919 2.00000 23.00000 16.00000;
1.00000 1.03000 -2.69688 -2.00000 28.00000 19.00000;
1.00000 1.01000 0.84981 -2.00000 22.00000 19.00000;
1.00000 1.01000 0.43845 2.00000 36.00000 21.00000;
1.00000 1.06000 1.32888 2.00000 28.00000 17.00000;
1.00000 1.02000 0.52292 2.00000 34.00000 22.00000;
1.00000 1.02000 0.18104 2.00000 32.00000 17.00000;
1.00000 1.03000 -0.33783 -2.00000 32.00000 22.00000;
1.00000 1.04000 0.65805 2.00000 30.00000 17.00000;
1.00000 1.03000 1.21888 2.00000 37.00000 10.00000;
1.00000 1.02000 2.11598 2.00000 29.00000 10.00000;
1.00000 1.02000 -0.02853 2.00000 27.00000 16.00000;
1.00000 1.04000 0.21777 2.00000 36.00000 16.00000;
1.00000 1.01000 0.30821 2.00000 29.00000 15.00000;
1.00000 1.03000 -0.69389 2.00000 30.00000 12.00000;
1.00000 1.04000 0.44792 2.00000 23.00000 15.00000;
1.00000 1.03000 0.15876 2.00000 28.00000 15.00000;
1.00000 1.02000 -1.05796 2.00000 36.00000 10.00000;
1.00000 1.05000 -1.51878 2.00000 32.00000 15.00000;
1.00000 1.03000 -0.91870 -2.00000 30.00000 15.00000;
--------------------------------
ERROR: matrix is ill-conditioned or badly scaled, condno = 68200
--------------------------------
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 /usr/local/freesurfer/subjects/qdec/Untitled/y.mgh
--fsgd /usr/local/freesurfer/subjects/qdec/Untitled/qdec.fsgd dods --glmdir
/usr/local/freesurfer/subjects/qdec/Untitled --surf fsaverage lh --label
/usr/local/freesurfer/subjects/fsaverage/label/lh.aparc.label --C
/usr/local/freesurfer/subjects/qdec/Untitled/contrasts/lh-Avg-Intercept-thickness.mat
--C
/usr/local/freesurfer/subjects/qdec/Untitled/contrasts/lh-Avg-thickness-Vein_Avg_tort-Cor.mat
2. The FSGD file (if using one)
3. And the design matrix above
Attempting to diagnose further
SumSq: Min=4.795832 (col 1), Max=145.206757 (col 5)
The scale is much different between columns 1 and 5, you may want to
normalize by subtracting the mean and dividing by the standard deviation.
Any help would be appreciated!
With regards
Korann
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