Hi James,
You can change the order of levels like this:
levels(viagraData$dose)<-c("placebo","low dose","high dose")
Although I don't know the exact names of the variable and its levels.
Jim
On Fri, Jun 5, 2015 at 7:19 AM, Richard M. Heiberger <r...@temple.edu> wrote:
> This example is based on ?glht
>
>> data(warpbreaks)
>> glht(amod, linfct = mcp(tension = "Dunnett"))
>
> General Linear Hypotheses
>
> Multiple Comparisons of Means: Dunnett Contrasts
>
>
> Linear Hypotheses:
> Estimate
> M - L == 0 -10.0
> H - L == 0 -14.7
>> levels(warpbreaks$tension)
> [1] "L" "M" "H"
>> warpbreaks$tension <- factor(warpbreaks$tension, levels=c("H","M","L"))
>> amod <- aov(breaks ~ tension, data = warpbreaks)
>> glht(amod, linfct = mcp(tension = "Dunnett"))
>
> General Linear Hypotheses
>
> Multiple Comparisons of Means: Dunnett Contrasts
>
>
> Linear Hypotheses:
> Estimate
> M - H == 0 4.72
> L - H == 0 14.72
>
>
> Changing the order of the levels is easy. Rearranging the data itself
> is not necessary.
>
> Rich
>
> On Thu, Jun 4, 2015 at 3:42 PM, James F. Henson
> <james_hen...@suagcenter.com> wrote:
>> 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
>>
>> [[alternative HTML version deleted]]
>>
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>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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