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Hey! I'm resending this email because I think it got lost on the list.
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 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)
The beta values extraction file contains 2 lines (image below).
[cid:69d5a8c2-68b8-43ac-85f3-0448f1e3a0b5]
* 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?
Thank you very much in advance.
Laura Willers de Souza
Master Student in Biochemistry
Zimmer Lab - Federal University of Rio Grande do Sul
- Porto Alegre/RS - Brazil
