compute the mean and stddev of your covariate, subtract the mean
from each covariate, and then divide the result by stddev.
Hi Greve
Thanks for your reply, can I have more detail about how to solve my problem. By the way, I may not think it's the problem about covariates.
Thank you.Jin
2016-09-28 15:29 GMT-04:00 Douglas Greve <greve@nmr.mgh.harvard.edu>:
______________________________Try normalizing your covariates (ie, subtract the mean and divide by the stddev).
On 9/28/16 3:07 PM, kinson li wrote:
Hi there,
Anyone can help me out? Thank you.
2016-09-28 13:46 GMT-04:00 kinson li <kinsonljc@gmail.com>:
Hello,
I would like to conduct an analysis using mri_glmfit but I'm getting this error:
ERROR: matrix is ill-conditioned or badly scaled, condno = 1e+08
I am appreciated you can help me solve this problem.
My command was:
mri_glmfit --y age9vs8ml01.mgh --fsgd new.fsgd dods --C age9vs8mlmatrix.mtx --surf fsaverage lh --cortex --glmdir glmdir.age9vs8ml
Design matrix ------------------
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
1.000 0.000 8.000 0.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
0.000 1.000 0.000 9.000;
------------------------------
-- ERROR: matrix is ill-conditioned or badly scaled, condno = 1e+08
------------------------------
--
Thanks
Jincheng.
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