[R] how to join these two models?

[Dieter Menne]

Sara Mouro wrote:
> 
> I have this 2 models that fit to my data:
> 
> M3varI <- update (M3, weights=varIdent(form= ~ 1|SITE))
> 
> M3AR1<-update(M3,correlation=corAR1())
> 
> How can I put them toghether in one final model?
> 
> 

This looks like lme in package nlme, but it is pure guesswork, since your
example is incomplete. Probably you should not use update, but something
like

   lme(xxxxx~xxxx, random =....., weights=varIdent..., correlation=corAR1())

but I am not sure if this somewhat overloaded fit will converge.

Dieter


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