Oh, right. You only have one data point (the difference) and you are computing one parameter (the mean), so you have 0 DOF. If you only have one data point, there are not statistical tests you can do
On 5/1/2020 3:34 AM, KennethSPrice wrote:
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In the FSGD file I have one subject pair (timepoint 1 and timepoint 2), and it is the only group. However, I removed --fsgd and replaced it with --osgm upon your reccomendation, and am still getting the error.
I am also having an issue visualizing the output of mri_preproc in freeview - isnt this mgh file supposed to be a volume? Is there a way to center the freeview cursor to the middle of the current volume?
Thanks, Ken
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Thursday, April 30, 2020 2:16 PM, Douglas N. Greve <dgreve@mgh.harvard.edu mailto:dgreve@mgh.harvard.edu> wrote:
how many subjects are there in your fsgd? How many groups in your fsgd file? Also, you should not use --osgm and --fsgd
On 4/30/2020 1:09 PM, KennethSPrice wrote:
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Hello Freesurfer friends!
I'm going through the "paired analysis" tutorial and am running into an issue with the mri_glmfit. I am running on just one subject pair. https://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis#Runmriglmfit
I ran mris_preproc on my 2 timepoints and am getting an error at mri_glmfit mris_preproc --target fsaverage --hemi lh \ --meas thickness --out lh.paired-diff.thickness.mgh \ --fsgd pairs.fsgd --paired-diff
mri_glmfit \ --glmdir lh.paired-diff \ --y lh.paired-diff.thickness.sm05.mgh \ --fsgd paired-diff.fsgd \
--osgm \
--surf fsaverage lh
I am getting an ERROR: DOF = 0.
MRI's have been put through recon-all and are in there own directories within SUBJECTS_DIR.
What is the cause of the error?
Thanks,
Ken
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