Dear spm users,
I want to run an analysis on subjects who had two MRI at two different time. I would like to know how can I put covariates in the flexible factorial model. I would like to adjust for age at baseline, TIV and delay between the two MRI!
ei:
subject1 65 1430 4.5
subject2 74 1498 4.2
How can I put this?
When I enter the values in my model I get an error! I understand why because I put less covariates than the number of scans! But I don't understand how I have to enter my covariates: Do I have to put twice the covariates for each subjects for correcting the two scans?
like:
subject1-MRI1 65 1430 4.5
subject1-MRI2 65 1430 4.5
subject2-MRI1 74 1498 4.2
subject2-MRI2 74 1498 4.2
Thanks for all,
Charlotte
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