[R] Can't run nlme with nested structure

[Pekka Kontiainen]

Hello!


So, my problem is following. I have bird offspring growth data and I'd 
like to model individual growth curves (aim is to study asymptotes and 
inflection points) with nlme according to Pinheiro & Bates 2000: first using 
nlsList to generate individual curves and then nlme to study the 
parameters and fixed effects. The data is structured to two levels. I 
have broods and individuals within the broods. Problems arise if I specify 
the groupedData object to have two levels. Running of the nlme gives me an 
error message "can't run the model with multiple levels", or something 
alike..

Is there a way around this or should I start looking fo another way of 
analysing the data?

Thank you for your time.

Pekka Kontiainen
Ph.D. Candidate
Bird Ecology Unit
Department of Environmental and Biosciences
P.O. Box 65 (00014) University of Helsinki 
FINLAND
Phone +35844-5496858

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Pekka Kontiainen
Ph.D. Candidate
Bird Ecology Unit
Department of Environmental and Biosciences
P.O. Box 65 (00014) University of Helsinki 
FINLAND
Phone +35844-5496858