i need some help interpreting some PET analyses. my design involves two patient groups (A & B) in
which each patient receives one resting FDG-PET. i am also measuring a physiological covariate (i'll
call C). to carry out these analyses, my understanding is that i create a design under single subject:
conditions & covariates and use group A or B for the condition.
what i want to know is how C is related to differences between metabolism in groups A and B. in
setting up my interaction contrasts, i used (0 0 1 -1) and (0 0 -1 1). if my design reads A, B, C*A,
C*B, am i correct in interpreting the 0 0 1 -1 contrast to show which areas are associated with an
increased relation with C?
thanks.
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