[R-sig-ME] extracting variance components in lme4?

[Jerome Goudet]

Douglas Bates wrote:
> On 2/6/07, Fabian Scheipl <f.abian at gmx.net> wrote:
>> try
>>
>> vc      <-VarCorr( model1 )
>> varcomps<-c(unlist( lapply(vc, diag) ), # random intercept variances
>>             attr(vc,"sc")^2)            # residual variance
>>
>> also works if you have multiple random terms (intercept and slope, e.g.) for a given grouping factor.
>> Extracts the respective variances without the covariances.
> 
> Yes, indeed.  That is better than the version that I suggested.  Thanks.
> 
> If a good name for such an extractor can be suggested I will
> incorporate it in the lme4 package.  Any suggestions for a name?

How about VarComp (for Variance Components)?



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-- 
Jérôme GOUDET
Dep. Ecology & Evolution
Biophore, UNIL-Sorge
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