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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). [cid:c5a3c332-10fc-4726-b15e-672b02ded1fa]
* 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?
Thanks in advance!
Laura Willers de Souza
Master Student in Biochemistry
Zimmer Lab - Federal University of Rio Grande do Sul
- Porto Alegre/RS - Brazil
