Indeed, the following works as well
On Oct 26, 2005, at 5:23 PM, P Ehlers wrote:
> fm1 <- aov(breaks ~ wool*tension, data = warpbreaks)
> TukeyHSD(fm1, c("wool","tension", "wool:tension"))
However, when working with my own dataset, I get the following errors.
I have some inkling this may be due to a slightly unbalanced sample
size, but am uncertain of this.
> rich.aov <- aov(X.open ~ Dock*Slip, data=dock_2004_data)
> TukeyHSD(rich.aov, c("Dock", "Slip"))
Error in rep.int(n, length(means)) : unimplemented type 'NULL' in 'rep'
In addition: Warning messages:
1: non-factors ignored: Slip in: replications(paste("~", xx), data = mf)
2: non-factors ignored: Dock, Slip in: replications(paste("~", xx),
data = mf)
I am pleased to know that these errors are not quite the
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