[R] R-help Digest, Vol 31, Issue 30

John Maindonald john.maindonald at anu.edu.au
Fri Sep 30 13:50:48 CEST 2005

With lme4, use of mcmcsamp can be insightful.  (Douglas Bates
drew my attention to this function in a private exchange of emails.)
The distributions of random effects are simulated on a log scale,
where the distributions are much closer to symmetry than on the
scale of the random effects themselves.  As far as I can see, this is
a straightforward use of MCMC to estimate model parameters; it is
not clear to me the results from the lmer() fit are used.
John Maindonald.

On 30 Sep 2005, at 8:00 PM, r-help-request at stat.math.ethz.ch wrote:

> From: Roel de Jong <dejongroel at gmail.com>
> Date: 29 September 2005 11:19:38 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] standard error of variances and covariances of the  
> random    effects with LME
> Hello,
> how do I obtain standard errors of variances and covariances of the  
> random effects with LME comparable to those of for example MlWin? I  
> know you shouldn't use them because the distribution of the  
> estimator isn't symmetric blablabla, but I need a measure of the  
> variance of those estimates for pooling my multiple imputation  
> results.
> Regards,
>   Roel.

John Maindonald             email: john.maindonald at anu.edu.au
phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
Centre for Bioinformation Science, Room 1194,
John Dedman Mathematical Sciences Building (Building 27)
Australian National University, Canberra ACT 0200.

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