You need to make `a' and `b' factors.
Andy
> From: array chip
>
> Hi,
>
> for balanced 2-way ANOVA, type I SS should be equal to
> Type III SS, this can be seen in the help page for
> summary.aov() as well. However, with the following
> simple example, I get different type I and III SS. can
> anyone advise?
>
> y<-rnorm(16,10,3)
> a<-c(rep(0,8),rep(1,8))
> b<-c(rep(0,4),rep(1,4),rep(0,4),rep(1,4))
> summary(aov(y~b*a),ssType=1)
> summary(aov(y~b*a),ssType=3)
>
> Thanks
>
>
>
>
>
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