Thanks a lot for the help. I am quite new to R and every bit of
information is very valuable for me.
Best wishes
Juan A. Balbuena
El 21/05/2010 17:05, ONKELINX, Thierry [via R] escribió:
Have a look at ?varClasses. You could you something like
varIdent(form =
~ 1|areatrai) or varExp(form = ~areatrai)
R-sig-mixed-models is a better list for this kind of questions.
Thierry
------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
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Belgium
Research Institute for Nature and Forest
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> -----Oorspronkelijk bericht-----
> Van: [hidden email]
> [mailto: [hidden email] ] Namens Tursiops
> Verzonden: vrijdag 21 mei 2010 16:14
> Aan: [hidden email]
> Onderwerp: [R] lme: model variance and error by group
>
>
> Hello
> I am trying to reproduce a mixed regression model published
> in (J Evol Biol 12:94-102) with PASW 17.03. The authors used
> SAS to fit the model using the following syntaxis:
>
> proc mixed nobound;
> class area individ trait;
> model a = side trait area side*trait side*area
> trait*area/ddfm = satterthwaite solution; random intercept
> side/subject = individ group = areatrai; repeated/local =
> quad(areatrai) subject = individ; run;
>
> The model specifies separate variance components and error
> variances for the grouping "areatrai" variable. This is
> indicated by "group= areatrai"
> and "local =
> quad (areatrai)", respectively.
>
> Since I currently have no access to SAS and this part of the
> analysis is absolutely central to my research, I would be
> very grateful if someone can tell whether it is possible to
> model the variance and error by group using lme or any other
> R package for linear mixed models.
>
> Any help will be much appreciated.
>
> Thanks
>
>
>
> --
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> group-tp2226207p2226207.html
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Dr. Juan A. Balbuena
Marine Zoology Unit
Cavanilles Institute of Biodiversity and Evolutionary Biology
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