[R] nlme_varcov matrix

[Spencer Graves]

      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 
> Chubut
> Argentina
>
> Tel: 54-2965/451301/451024/451375/45401 (Int:277)
> Fax: 54-29657451543
>
>
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