Dear all,
I am trying to calculate some measure of the amount of variability in the response variable that is explained by a model fitted in lmer 
m1<-lmer(response-var ~ Condition+(1|Site/Area/Transect),family="binomial") . 
I've seen from the literature that the precentage of explained deviance is a common measure. How can I calculate it?
Thanks a lot for your help, I hope this is not too shallow.
Best
Fabio
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Fabio Bulleri, PhD
Dipartimento di Biologia
Università di Pisa
Via A. Volta 6, I-56126, Pisa, Italy
Tel. +39 050 2211448
Fax +39 050 2211410
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