Date: Tue, 6 Dec 2011 13:46:48 -0500
Reply-To: Suzanne Decker <suzanne.decker@YALE.EDU>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Suzanne Decker <suzanne.decker@YALE.EDU>
Subject: test for homogeneity of regression for stepdown F in doubly
I am working on a dataset that has data on client variables across two
assessment types and four time points under 3 experimental conditions.
With the help of a statistician, our team ran a doubly multivariate ANOVA
to examine changes in a group of client variables across time, across
assessment types, and across experimental conditions. We obtained the
omnibus results as well as both univariate and stepdown F tests.
Tabachnick & Fidell's text (5th ed) suggests reporting the stepdown
because the DVs are correlated. The text also says I should test for
homogeneity of regression, and gives an example of the syntax needed for a
multivariate test. However, does anyone know how the setup would be done
for a doubly multivariate test like the one we used? I have tried
adapting the syntax provided - no luck.
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