Hello FS experts,

I have 3 groups, e.g : normal, MCI, and AD. Am I correct in my understanding that QDEC would not be applicable here?

In my subjectdir, I created a folder for mri_glmfit analyes called FSGD.

In that folder, I have the FSDG file and the relevant contrasts.

GroupDescriptorFile 1

Class HC

Class MCI

Class AD

input sub1-base MCI

input sub2-base AD

input sub3-base HC

My contrast is a simple [1 0 -1] for HC > AD. I called it HC-AD.mtx and saved it in the FSGD folder.

Then, in the SUBJECTdir/FSGD folder, I run the mri_glmfit command as follows:

mri_glmfit --glmdir fsgd/ --y y.mgh --fsgd g3v0.fsgd --C normal-ad.mtx

My question is, what is y.mgh as shown in the examples on the Wiki? It is supposed to be an input file, but what file is this?

Thank you very much!

Best Regards,

Elijah

Elijah Mak, Gates Scholar

PhD Candidate | Psychiatry

University of Cambridge | Department of Psychiatry

Trinity College, Cambridge, CB2 1TQ