R help - Aug 2005 - Mixed Effects Model Power Calculations

Is there an R package available that would facilitate doing a power/sample
size analysis for linear mixed effects models?

I have seen the Java applets made available by Russell Length which would
seem to be able to handle most any lme, but there is little documentation
and it's not clear how the models need to be formulated.

Rick B.

On Ti, 2005-08-16, 21:17, rab45+ at pitt.edu skrev:
> Is there an R package available that would facilitate doing a power/sample
> size analysis for linear mixed effects models?
I'm not aware of such a package (others might be...).

When it comes to sample size calculations, especially for tricky designs
and/or advanced methodology, simulation is usually the best approach. An
example using `lme' can be found at

http://maven.smith.edu/~nhorton/R/


HTH,
Henric
> I have seen the Java applets made available by Russell Length which would
> seem to be able to handle most any lme, but there is little documentation
> and it's not clear how the models need to be formulated.
>
> Rick B.
>
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