Hi Freesurfer Experts,
I’m a new user of Freesurfer, and I learn how to use this software mainly through Wiki. When I came to the step of using GLM to compare group differences, I was confused on the design of 3g4v matrix. In my study, there were 3 classes (A / B / C group) and 4 concomitant variables (gender, age, education, and Moca test score). It’s supposed to be 15 regressors in this design, but I don’t know how to use the numbers (like 1, -1, 0, 0.5, -0.5, etc.) to create a correct matrix. I wonder if you could provide a 3g4v matrix in detail for me. I’ll be grateful if you can help. I hope I’m not bothering you too much, and I’m looking for your reply. Best wishes,
Li
Hi Li,
You can find some example FSGD tables here, which you can alter to fit your analyses.
https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples
Best, Lee
On Sun, 22 Nov 2015, nellie wrote:
Hi Freesurfer Experts,
I’m a new user of Freesurfer, and I learn how to use this software mainly through Wiki. When I came to the step of using GLM to compare group differences, I was confused on the design of 3g4v matrix. In my study, there were 3 classes ( A / B / C group) and 4 concomitant variables (gender, age, education, and Moca test score). It’s supposed to be 15 regressors in this design, but I don’t know how to use the numbers (like 1, -1, 0, 0.5, -0.5, etc.) to create a correct matrix. I wonder if you could provide a 3g4v matrix in detail for me. I’ll be grateful if you can help. I hope I’m not bothering you too much, and I’m looking for your reply.
Best wishes,
Li
freesurfer@nmr.mgh.harvard.edu
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Lee Tirrell -
nellie