Re: [R] nlme_varcov matrix

From: Spencer Graves <spencer.graves_at_pdf.com>
Date: Sat 14 Oct 2006 - 18:47:56 GMT

      Do you have Pinheiro and Bates (2000) Mixed-Effects Models in S and S-Plus (Springer)? That book should contain worked examples to answer your question. If the library at the Patagonia National Center does not have a copy, I recommend you do what you can to encourage them to obtain a copy. There are many, many applications in the study of biology and the management of aquatic resources for the types of analyses described in that book -- and if people in your institute are not routinely using those types of analyses, they may be making decisions using misleading analyses because of the failure to explicitly model important components of variance -- and you can quote me to your librarian if that would help.

      Beyond that, have you reviewed 'help(package="nlme")', "methods(class='lme')", and "methods(class='nlme')" -- plus 'str' of the output of an 'nlme' run.

      If you'd like further help from this listserve, please provide commented, minimal, self-contained, reproducible code as suggested in the posting guide "www.R-project.org/posting-guide.html".

      Para servirle. 
      Spencer Graves    

gabriela escati peñaloza wrote:
> Hi all!
> Is there a function that provides the VarCov matrix
> for a nlme objects? How I can extract the matrix for a
> nlme model fitted?
>
> I would appreciate any guidance
>
> Regards
>
> Lic. Gabriela Escati Peñaloza
> Biología y Manejo de Recursos Acuáticos
> Centro Nacional Patagónico(CENPAT).
> CONICET
> Bvd. Brown s/nº.
> (U9120ACV)Pto. Madryn
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> Argentina
>
> Tel: 54-2965/451301/451024/451375/45401 (Int:277)
> Fax: 54-29657451543
>
>
>
>
>
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>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sun Oct 15 04:52:06 2006

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