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...y help me with this? And one more question: is it correct to use pnorm (where John Maindonald used exp(hat)/(1+exp(hat)))? Thanks so much in advance! Linda Previous post by John Maindonald: ciplot <- function(obj=model4, data=zerotest,xcol=2,nam="hours"){ cilim <- function(obj, xcol){ b <- fixef(obj) vcov <- summary(obj)@vcov X <- unique(model.matrix(obj)) hat <- X%*%b pval <- exp(hat)/(1+exp(hat)) # NB, designed for logit link U <- chol(as.matrix(summary(obj)@vcov)) se <- sqrt(apply(X%*%t(U),...

Hi, I am using lmer to analyze habitat selection in wolverines using the following model: (me.fit.of <- lmer(USED~1+STEP+ALT+ALT2+relM+relM:ALT+(1|ID)+(1|ID:TRKPT2),data=vdata, control=list(usePQL=TRUE),family=poisson,method="Laplace")) Here, the habitat selection is calaculated using a so-called discrete choice model where each used location has a certain number of alternatives