Post Hoc Groupings
Indeed, that does it. Odd. I guess as Slip was a number, it needed to be categorized. Interesting... Not if only I can figure out how to get the TukeyHSD grouping table....
On Oct 26, 2005, at 7:35 PM, Mark Lyman wrote:
Looking at the errors your code produces, it looks like you need to
make Dock and Slip factors.
dock_2004_data$Dockf<-factor(dock_2004_data$Dock)
dock_2004_data$Slipf<-factor(dock_2004_data$Slip)
rich.aov <- aov(X.open ~ Dockf*Slipf, data=dock_2004_data)
TukeyHSD(rich.aov, c("Dockf", "Slipf"))
Jarrett Byrnes wrote:
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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