Re: [R] Post Hoc Groupings

From: Jarrett Byrnes <>
Date: Thu 27 Oct 2005 - 10:35:12 EST

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( ~ Dock*Slip, data=dock_2004_data)  > TukeyHSD(rich.aov, c("Dock", "Slip"))

Error in, 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 mailing list PLEASE do read the posting guide! Received on Thu Oct 27 10:36:39 2005

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