Hello R-users,
I am trying to obtain Type III SS for an ANOVA with subsampling. My design
is slightly unbalanced with either 3 or 4 subsamples per replicate.

The basic aov model would be:
fit <- aov(y~x+Error(subsample))

But this gives Type I SS and not Type III.

But, using the drop() option:
drop1(fit, test="F")

I get an error message:
"Error in UseMethod("extractAIC") : no applicable method for "extractAIC"

Changing the "contrasts" to "contr.helmert", "contr.poly" also does not
help.

Can I use library(car) for unbalanced subsamples?

I am very confused.
Any help would be greatly appreciated.
-Sam

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