Re: [Freesurfer] glmfit - matrix is ill-conditioned or badly scaled

2014-01-30 Thread Douglas N Greve
No, sorry, you'll have to create a new FSGD. Just compute the mean of each covariate, then subtract the mean from the value for each subject. doug On 01/30/2014 05:46 PM, Linda Zhang wrote: > Thanks Doug. Can that be done within the fsgd file/command line? > I've read threads on demeaning but

Re: [Freesurfer] glmfit - matrix is ill-conditioned or badly scaled

2014-01-30 Thread Linda Zhang
Thanks Doug. Can that be done within the fsgd file/command line? I've read threads on demeaning but was never clear on how to do it automatically. Linda On 30 January 2014 14:34, Douglas N Greve wrote: > Linda, try demeaning your covariates and see if the problem goes away > doug > > > On 01/30

Re: [Freesurfer] glmfit - matrix is ill-conditioned or badly scaled

2014-01-30 Thread Douglas N Greve
Linda, try demeaning your covariates and see if the problem goes away doug On 01/30/2014 03:24 PM, Linda Zhang wrote: > Dear all, > > Whilst running mri_glmfit, the following error occurred: > > ERROR: matrix is ill-conditioned or badly scaled, condno = 12375.1 > > I've attached the design matrix