Message-ID: <4047.83.253.10.207.1124268176.squirrel@poisson.statisticon.se>
Date: 2005-08-17T08:42:56Z
From: Henric Nilsson
Subject: Mixed Effects Model Power Calculations
In-Reply-To: <46344.128.147.28.3.1124219876.squirrel@webmail.pitt.edu>
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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