Dear SPMers:
Would like to get your help on the following problem:
We have two groups: normal and patient.
Each subject (from either normal group or patient group) has two PET scans
under
each of two conditions (4 scans per subject, two conditions: hunger (H)
and satiation (S)).
We have compared the change of H vs S between the two groups, i.e.,
(Hn-Sn)-(Hp-Sp) (Hn: hunger condition for normal subjects, others defined
similarily).
This analysis could be done very easily using SPM.
Now, we would like to do the same comparison accounting for resting
metabolic
rate (RMR) as a covariate. The problem is that each subject has only one
RMR reading.
My question:
(1) Can I enter the same RMR value four times (for each subject)
corresponding to the four scans?
(2) If not, what is the best way to do this kind of analysis?
Many thanks in advance!
Kewei Chen
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