



  


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] escribi&oacute;:
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 &amp; Kwaliteitszorg
  
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Belgium
  
  
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  [hidden email] 
  
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&nbsp; 
  
&gt; -----Oorspronkelijk bericht-----
  
&gt; Van: [hidden email]  
&gt; [mailto: [hidden email] ] Namens Tursiops
  
&gt; Verzonden: vrijdag 21 mei 2010 16:14
  
&gt; Aan: [hidden email] 
  
&gt; Onderwerp: [R] lme: model variance and error by group
  
&gt; 
&gt; 
&gt; Hello
  
&gt; I am trying to reproduce a mixed regression model published 
&gt; in (J Evol Biol 12:94-102) with PASW 17.03. The authors used 
&gt; SAS to fit the model using the following syntaxis:
  
&gt; 
&gt; proc mixed nobound;
  
&gt; class area individ trait;
  
&gt; model a = side trait area side*trait side*area 
&gt; trait*area/ddfm = satterthwaite solution; random intercept 
&gt; side/subject = individ group = areatrai; repeated/local = 
&gt; quad(areatrai) subject = individ; run;
  
&gt; 
&gt; The model specifies separate variance components and error 
&gt; variances for the grouping "areatrai" variable. This is
  
&gt; indicated by "group= areatrai"
  
&gt; and "local =
  
&gt; quad (areatrai)", respectively.
  
&gt; 
&gt; Since I currently have no access to SAS and this part of the 
&gt; analysis is absolutely central to my research, I would be 
&gt; very grateful if someone can tell whether it is possible to 
&gt; model the variance and error by group using lme or any other 
&gt; R package for linear mixed models. 
&gt; 
&gt; Any help will be much appreciated.
  
&gt; 
&gt; Thanks
  
&gt; 
&gt; 
&gt; 
&gt; --
  
&gt; View this message in context: 
&gt; http://r.789695.n4.nabble.com/lme-model-variance-and-error-by- 
&gt; group-tp2226207p2226207.html
  
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&gt; 
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&gt; PLEASE do read the posting guide 
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&gt; 
  
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-- 


Dr. Juan A. Balbuena

Marine Zoology Unit

Cavanilles Institute of Biodiversity and Evolutionary Biology

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