[R] TukeyHSD troubles

Bart Joosen bartjoosen at hotmail.com
Fri Feb 26 08:10:00 CET 2010

treat_code isn't a factor, but a numeric variable.

You should use:
summary(aov(EtoH~as.factor(treat_code), mydata))
TukeyHSD(aov(EtoH~as.factor(treat_code), mydata))

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