Hi
we try to analyse a PET study with 2 groups of subjects in 2
conditions. The idea is to look at group differences in each condition
as well as in the response to the conditions.
We have tried to model this as flexible factorial, 2 factors
(subjects, conditions), 2 main effects (subjects, conditions) with an
interaction between the two. (The idea is to define a contrast where
we can "pick out" the subjects according to their group.)
However, no contrasts are accepted by the contrast manager, not even
the simple contrast "condition1 - condition2"!?!
Any help is appreciated ...
Markus
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