On 2/17/2020 6:51 AM, Star Xi wrote:
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Dear FS experts,
Hi!
I have a very basic question about GLM model in FS-FAST.
After GLM analysis, there is a beta.nii under the analysis/ directory
and a ces.nii under each contrast/ directory.
In the tutorial, beta.nii is the regression coefficients and ces.nii
is contrast effect size (contrast matrix * regression coef).
My question is :
1. both of them are regression coefficients, what’s the difference
bewteen beta.nii and ces.nii.？
ces is a contrast of regresgression coefficients (ie, ces = C*beta where
C is the contrast matrix), so they are related but not exactly the same
thing
2. I want to do ROI analysis and extract the signal change in the
given ROI from each individual. Which value represent the signal
change (beta, ces, ceavar or t)?
either ces or beta. Usually you would make a contrast that embodies your
hypothesis, then use the ces
Any suggestions are welcome!
Thanks
Star
Fudan University
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