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Good morning Freesurfer Team!
I would like to use GLM on my longitudinal study to measure change between two time points. I followed the longitudinal tutorial, and to my understanding, I would move on to the general glm tutorial next. The longitudinal tutorial says that "you can compare groups similar to a cross sectional analysis", but when we run stats on our significant clusters our results look "odd". I may have misunderstood the tutorial, but I plugged the longitudinal timepoints into my fsgd file like this:
Input Subject1_TP1 subject 57 0.93
Input Subject1_TP2 subject 57 0.93
Input Subject2_TP1 subject 64 1.22
Input Subject2_TP2 subject 57 1.22
I'm not sure if what we ran is actually finding change between timepoints in our subjects. We happened across a glm paired-analysis tutorial. Should we re-run our data through that instead? The longitudinal tutorial only referenced the regular glm tutorial, so I want to make sure that we are following the correct steps - perhaps there is something I did wrong with my fsgd file? The paired-analysis tutorial seems like it may be appropriate, but I was hoping you could clear up our confusion before we move forward.
Thank you, Vince