Please note that this is S-news, not SPSS-news. I'd guess many people on
the list don't use SPSS. I, for one, can't read the code you posted, nor
understand the terminology used by SPSS. The point is that you should ask
the question in a more appropriate forum.
Andy
> From: Raffaella.Milani@tvu.ac.uk
>
> Can anyone help me to understand why the estimated marginal means in
> Univariate General Linear Model (calculated by SPSS) change
> if I include
> an interaction in the model? I understand that they adjust to
> covariates, but why inserting an interaction should change
> the estimated
> marginal means and if so which means should I use and on what basis?
> Thanks a lot for your help.
>
> See the two sintaxes below
>
> UNIANOVA
>
> gsi1 BY dependence stress
> /METHOD = SSTYPE(3)
> /INTERCEPT = INCLUDE
> /PLOT = PROFILE( stress*dependence dependence*stress )
> /EMMEANS = TABLES(dependence)
> /EMMEANS = TABLES(stress)
> /EMMEANS = TABLES(dependence*stress)
> /PRINT = DESCRIPTIVE PARAMETER
> /CRITERIA = ALPHA(.05)
> /DESIGN = depend1 stress dependence*stress .
>
>
> UNIANOVA
>
> gsi1 BY dependence stress
> /METHOD = SSTYPE(3)
> /INTERCEPT = INCLUDE
> /PLOT = PROFILE( stress*dependence dependence*stress )
> /EMMEANS = TABLES(dependence)
> /EMMEANS = TABLES(stress)
> /EMMEANS = TABLES(dependence*stress)
> /PRINT = DESCRIPTIVE PARAMETER
> /CRITERIA = ALPHA(.05)
> /DESIGN = dependence stress .
>
>
>
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