Hi,
 
I measured leaf characteristics. The leaves are grouped in trees which are, on their turn, grouped in provenances.
I want to model those leaf characteristics in function of climate variables (measured on provenance level) and pruning characteristics (measured on tree level). I also want to see if the effect of pruning differs between provenances (provenance-pruning interaction).
The problem is that there cannot be an interaction between pruning and tree, because pruning is measured on tree level. 
 
in lme4, I think I can specify this model as follows:
 
response ~ climate_factor*pruning + (pruning|provenance) + (1|provenance/tree)
 
Or is there another way?
 
Is it possible to define this model in the nlme library (I need a variance structure, which doesn't exist in lme4)?
 
Thanks a lot!
Sebastiaan
 
Sebastiaan De Smedt
Department of Bioscience Engineering
University of Antwerp
Belgium
Tel.: +32 (0)3 265 35 17
Fax.: +32 (0)3 265 32 25

	[[alternative HTML version deleted]]


