Yes, first line intercept, 2nd line slope
On 4/12/2022 3:44 PM, Laura Willers de Souza wrote:
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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 valuesfrom some analyzes and I would like toknow
if I'm extracting and interpreting these valuescorrectly.
To extract the beta values I used this command:
mri_segstats
--seglh.cortisol_CSF.glmdir/cortisol_CSF_slope/perm.th20.neg.sig.ocn.mgh--i
lh.cortisol_CSF.glmdir/beta.mgh --excludeid 0
--avgwflh.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
Variablescortisol_CSF
Input011_S_0003_S9128Main2.397895273
Input022_S_0004_S9233Main2.772588722
Input011_S_0005_S9137Main3.044522438
Input011_S_0008_S9196Main2.397895273
Input011_S_0010_S8800Main2.151762203
... (n=300)
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?
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
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