SPMers
in SPM fMRI I'm running a multiple regression model and am interested in
gray matter change over time.
Do I assign 6 covariates for one subject group with 3 time points(T0 T10
T60) with one metabolite level:
setting the first three for group assignment, the last 3 for metabolite level
111000000
000111000
000000111
23 24 56 78 0 0 0 0 0 0 0 0
0 0 0 0 32 54 65 87 0 0 0 0
0 0 0 0 0 0 0 0 55 66 77 88
what I"m not sure about is what my contrast are for:
1) which gray matter areas are +vely correlated with the metabolite over
all three times points : would this be [000111]?
2) which gray matter areas are +vely correlated with gray matter loss:T0>T60
Any help with this would be very greatly appreciated espcially number 2).
Thanks in advance for your time.
Maria
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