Amelie LESCROEL <lescroel_cebc <at> no-log.org> writes: > > Hello, > > Im trying to fit the following model: > > Dependent variable: MAXDEPTH (the maximum depth reached by a penguin during > a given dive) > > Fixed effects: SUCCESSMN (an index of the individual quality of a bird), > STUDYDAY (the day of the study, from -5 to 20, with 0=Dec 20), and the > interaction SUCCESSMN*STUDYDAY > > Random effect: BIRD (the bird id, as each bird is performing several dives) >
It isn't immediately clear to me why the maximum depth should be Poisson-distributed ... as R is trying to tell you, Poisson distributions only make sense for integer data. Your best bets are probably (1) reconsider the error distribution, (2) perhaps trying using nlme instead of lmer -- it is more polished, and you can use Pinheiro and Bates "Mixed-Effects Models in S and S-PLUS" as a reference. Ben Bolker ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
