[R] Using lme (nlme) to find the conditional variance of therandom effects

[Doran, Harold]

No, don't reach into the bVar slot. Use the proper extractor function
ranef() with postVar=T. There is no similar function for lme() 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Rick Bilonick
> Sent: Monday, November 12, 2007 4:40 PM
> To: R Help
> Subject: [R] Using lme (nlme) to find the conditional 
> variance of therandom effects
> 
> Using lmer in the lme4 package, you can compute the 
> conditional variance-covariance matrix of the random effects 
> using the bVar slot:
> 
> bVar: A list of the diagonal inner blocks (upper triangles 
> only) of the positive-definite matrices on the diagonal of 
> the inverse of ZtZ+Omega.
> With the appropriate scale factor (and conversion to a 
> symmetric matrix) these are the conditional 
> variance-covariance matrices of the random effects.
> 
> Is there anything similar in the nlme package using the lme function?
> 
> Rick B.
> 
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