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contrastar
2012 Jul 09
1
Type II ANOVA for user-defined contrasts with covariates
...trying to use a
type II ANOVA for a model with user-specified contrasts and covariates.
I have two treatment groups and a control group. I'm comparing average
treatment to controls and also between the two treatment groups, but I'm
also looking to adjust for age and gender as covariates:
contrastMat=cbind(c(-1,-1,2),c(1,-1,0))
contrasts(groups)=contrastMat
Model=lm(Response~Age+Gender+Age:Gender+groups)
since I'm interested in SS(R | A,G,AG)
I was hoping then to use the Anova() function in the car() package to find
the type II ANOVA for my specified contrasts, but when I do so it only
l...