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justin bem <justin_bem <at> yahoo.fr> writes:> I want to estimate a nonlinear mixed effect model using nlme package or lme4.How can I specify this> > y=exp(B'X)/(1+exp(B'X)). the same model can be obtained with logit(y)=B'X butI have many value of 1 in y logit(1)=Inf. Using exp in this case is a fairly common approach, and there are some examples in the Pinheiro/Bates Book, chapter 8.2 (look for orange tree); or, if you do not have access to it, look at ch08.r in library/nlme/scripts Dieter