Jake,

You can easily use glht for that.
See ?MMC in the HH package for examples.
You may need
   install.packages("HH") ## if you don't already have HH.
Specifically, look at the examples showing the use of focus.lmat


On Thu, Sep 16, 2010 at 11:43 AM, Jake Kami <jakejkami@gmail.com> wrote:

> dear list,
>
> i am using a multifactorial design with two treatments (factor A: drugs,
> three levels; factor B: theraphy, two levels) and a time factor (three
> levels, different timepoint). hypothetically, i measured the same subjects
> for all treatements and timepoints, so its a repeated measurement design.
> now i ran an anova in R and also some Tukey post-hoc tests using glht. but
> what i am actually interested in is to perform conditional contrasts, f.i.
> A1 for the 1st timepoint vs. A1 for the 2nd time (to put it in words: an
> evaluation of whether this particular type of drug exerts an effect over
> time). so far, i couldnt find any function doing this. i also queried the r
> help list archive but without success.
>
> any help on that would be appreciated.
>
>
> kind regards
>
> j
>
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