I'm not sure if this will work for your experiment but have you tried
respecifying the model in terms of a nested design.
Using syntax you can type A(B) in the DESIGN subcommand which means A nested
within B. The code example below would fit the model
Y = Constant + A+ B(A)
UNIANOVA
Y BY A B
/METHOD = SSTYPE(3)
/INTERCEPT = INCLUDE
/CRITERIA = ALPHA(.05)
/DESIGN = A B(A) .
So you get tests for the main effect of A and the effect of B within A.
"Johannes Hartig" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi group,
> I've posted this problem a while ago without getting an answer, and I
> still didn't find out myself,
> so here is another try:
> (I'm working with SPSS 9.0)
> When I do a GLM-repeated measures analysis, in SPSSI get tests for all
> interactions bewteen every within-and every between-subject factor.
> Supposed I don't want to include all these interactions in my model,
> e.g. the interaction between a covariate and a within-subject
> factor: Is there a way to adjust my model not to include this effect?
> (Syntax welcome!)
> Or, if this is not possible (I vaguely remember MANOVA in former
> versions did not test these interactions as default), is there a good
> statistical reason to test all possible within*between-interactions?
> Any help is appreciated,
> Johannes Hartig
>
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