In case anyone else is interested... I just found another solution, which has some pros and cons compared to Dennis' solution...
plot(comparePred(fit.lme, update(fit.lme, y ~ log(age)))) # Pros - Automatically adds a legend # Cons - Only works for comparing two models # Dennis' solution extends to more than two models p1 <- plot(augPred( fit.lme ), ylim=c(20,65) ) p2 <- plot(augPred(update(fit.lme, y ~ log(age)) ), ylim=c(20,65), col.line = "red") p3 <- plot(augPred(update(fit.lme, y ~ age + I(age^2))), ylim=c(20,65), col.line="green") p1+p2+p3 Ramzi -- View this message in context: http://r.789695.n4.nabble.com/How-do-I-overlay-two-trellis-plots-of-lme-fitted-lines-produced-by-plot-augPred-tp3652204p3654443.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.