R help - Aug 2008 - post hoc tests two way repeated measures anova

Hi,

is there a specific/appropriate function/package to perform post hoc tests
when running a two way repeated measures anova? I'm looking for something
that will be equivalent to the 'TukeyHSD()' for between subjects anova
(with
'aov()'). For one way repeated measures anova, the
'pairwise.t.test()'
function seems to work correctly but the results are questionable for two+
way anovas, as if the adjustment of the p values for multiple comparisons
was not correct.

any suggestion?

jp
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Jean-Pierre Bresciani <bresciani <at> tuebingen.mpg.de> writes:
> is there a specific/appropriate function/package to perform post hoc tests
> when running a two way repeated measures anova? I'm looking for
something
> that will be equivalent to the 'TukeyHSD()' for between subjects
anova (with
> 'aov()'). For one way repeated measures anova, the
'pairwise.t.test()'
> function seems to work correctly but the results are questionable for two+
> way anovas, as if the adjustment of the p values for multiple comparisons
> was not correct.
Classical repeated measurement has fallen a bit out of favor, because mixed
models as in lme (package nlme) and lmer(package lme4) are MUCH more flexible
and in general more stable when data are missing.

So I recommend to switch to lme (better documented, currently), and use

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/20725.html

as a starter when trying to do multiple comparisons.

Dieter Menne (T?bingen)