Re: [Freesurfer] Question about mri_glmfit-sim

Thank you, Doug. Regards MV On Fri, Oct 28, 2016 at 8:46 AM, Douglas Greve wrote: > Using perm will certainly avoid a lot of questions. You should still use > the --2spaces. You changed the threshold from 2.3 to 1.3. This threshold is > arbitrary, you don't necessarily need/want a lower thresho

Re: [Freesurfer] Question about mri_glmfit-sim

Using perm will certainly avoid a lot of questions. You should still use the --2spaces. You changed the threshold from 2.3 to 1.3. This threshold is arbitrary, you don't necessarily need/want a lower threshold for perm. I've been doing some experiments lately, and a threshold of 2.3 with >5mm

[Freesurfer] Question about mri_glmfit-sim

Hi FreeSurfer experts, I am currently performing some cortical thickness comparisons in my group of subjects and using mri_glmfit-sim --glmdir my_dir --cache 2.3010 --cwpalthresh 0.05 --2spaces found some clusters that have significantly different cortical thickness values, Given Eklund et al PNA

Re: [Freesurfer] Question about mri_glmfit

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 : > Try normalizing your covariates (ie, subtract the mean and divide by the > stddev). >

Re: [Freesurfer] Question about mri_glmfit

compute the mean and stddev of your covariate, subtract the mean from each covariate, and then divide the result by stddev. On 9/28/16 3:47 PM, kinson li wrote: 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

Re: [Freesurfer] Question about mri_glmfit

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 >: /Hello,/ /I would like to conduct an analysis us

Re: [Freesurfer] Question about mri_glmfit

Hi there, Anyone can help me out? Thank you. 2016-09-28 13:46 GMT-04:00 kinson li : > *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 so

[Freesurfer] Question about mri_glmfit

*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 age9v