On 5/7/17 1:16 PM, Laura Ferrero Montes wrote:
Dear FS team,
Thank you very much for your help. Just a few more questions.
I want to perform a statistical analysis between two groups:controls and patients, using age and IQ as covariates. First I have to test if there is an interaction between group and covariate using DODS.
My questions are:
Q1) Do I have to test age and IQ separately, or together?
I'm not sure, but I'd say together
Q2) In case that there is not interaction in any of the covariates, can I use the same FSGD file but do I have tu run it as DOSS? How it could be done?
Yes, you can use the same file. When you spec the fsgd file, just add doss afterwards, get --fsgd myfsgdfile doss
I would appreciate if you could give me some hints or examples about the matrices and contrast files that I must use.
You have to change the contrast matrix. See this page for help https://surfer.nmr.mgh.harvard.edu/fswiki/DodsDoss
Thank you, All the best,
Laura _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer