Sure! The fsgd file looks like this:

GroupDescriptorFile 1                 

Title cortisol_CSF                    

Class Main                     

Variables      cortisol_CSF           

Input   011_S_0003_S9128       Main    2.397895273

Input   022_S_0004_S9233       Main    2.772588722

Input   011_S_0005_S9137       Main    3.044522438

Input   011_S_0008_S9196       Main    2.397895273

Input   011_S_0010_S8800       Main    2.151762203

... (n=300)

Best,

Laura.

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On 4/3/2022, Douglas N. Greve wrote:

Can you send the fsgd file?

On 4/1/2022, Laura Willers de Souza wrote:

Hello FreeSurfer Developers,

I'm extracting beta values ​​from some analyzes and I would like to know if I'm extracting and interpreting these values ​​correctly.

To extract the beta values ​​I used this command:

mri_segstats --seg lh.cortisol_CSF.glmdir/cortisol_CSF_slope/perm.th20.neg.sig.ocn.mgh --i lh.cortisol_CSF.glmdir/beta.mgh --excludeid 0 --avgwf lh.cortisol_CSF.beta.clusters.dat

The model consists of 1 group and 1 covariate.

I used the contrasts for intercept and slope.

The beta values ​​extraction file contains 2 lines (image below).

  * Would the first line be the beta value for the intercept and the

    second line for the slope?

  * Thus the glm equation for the 1st cluster would be:   cortical

    thickness = 2.57 - 0.12X + n

Is this correct?