[R] Power analysis for MANOVA?

[Stephan Kolassa]

Hi Adam,

My (and, judging from previous traffic on R-help about power analyses, 
also some other people's) preferred approach is to simply simulate an 
effect size you would like to detect a couple of thousand times, run 
your proposed analysis and look how often you get significance. In your 
simple case, this should be quite easy.

HTH,
Stephan


Adam D. I. Kramer schrieb:
> Hello,
> 
>     I have searched and failed for a program or script or method to
> conduct a power analysis for a MANOVA. My interest is a fairly simple case
> of 5 dependent variables and a single two-level categorical predictor
> (though the categories aren't balanced).
> 
>     If anybody happens to know of a script that will do this in R, I'd
> love to know of it! Otherwise, I'll see about writing one myself.
> 
>     What I currently see is this, from help.search("power"):
> 
> stats::power.anova.test
>                         Power calculations for balanced one-way
>                         analysis of variance tests
> stats::power.prop.test
>                         Power calculations two sample test for
>                         proportions
> stats::power.t.test     Power calculations for one and two sample t
>                         tests
> 
>     Any references on power in MANOVA would also be helpful, though of
> course I will do my own lit search for them myself.
> 
> Cordially,
> Adam D. I. Kramer
> 
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