[R] Dunnett Test in 'multicomp' package

James F. Henson james_henson at suagcenter.com
Thu Jun 4 21:42:41 CEST 2015


Greetings

Below is my code.

library("multcomp")
viaModel1 <- aov(libido ~ dose, data=viagraData)
dunnettModel <- glht(viaModel1 , linfct = mcp(dose = "Dunnett"), base = "placebo")

The code base="placebo" is ignored.  All treatments are compared to the first treatment in the order, which is "high dose".  It is possible to rearrange the order so that "placebo' is first, but this is inconvenient.

Thanks,
James F. Henson

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