Dear all,

 

 

My question is maybe too basic for this mailing list, but I searched in
the archive and didn't get an appropriate answer...

 

I fitted a model in the lme4-library:

 

Response ~ 1 + (1|provenance/tree) + (1|pruning/tree)

 

Trees are nested in provenances, as well as in pruning classes. 

 

In the diagnostic plots, I've seen that the variance of the residuals is
not constant (rising with rising response).

I understand from the mail archive that it is not possible to use a
variance function in the lme4-library. 

 

Can I fit the same model with the nlme-library? Or is there a way to
implement a variance function in the lme4-library?

 

 

Thanks a lot!

Sebastiaan

   

 

  

 

Sebastiaan De Smedt

Dept. Bioscience Engineering

University of Antwerp

Groenenborgerlaan 171-V616

B-2020 Antwerpen

T: +32 (0)3/265.35.17

F: +32 (0)3/265.32.25

 

 

P  Help to save paper - do you really need to print this e-mail???  P

 


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