Displaying 1 result from an estimated 1 matches for "wantinteraction".
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aninteraction
2009 Sep 08
3
Omnibus test for main effects in the face ofaninteraction containing the main effects.
...two model, so I don't even know how to perform the
ombnibus
test for the interaction!
I am fitting a random effects ANOVA with two factors Group which has two
levels and Time which has three levels:
fita<-lme(Post~Time+factor(Group)+factor(Group)*Time,
random=~1|SS,data=blah$alldata)
I wantinteraction. I believe I can get the omnibus test for the interaction by
running the model:
fitb<-lme(Post~Time+factor(Group), random=~1|SS,data=blah$alldata)
followed
by anova(fita,fitb).
How do I get the omnibus test for the main effects i.e. for Time and
factor(Group)? I could drop each from the model,...