swertie <v_coudrain <at> voila.fr> writes: > I am trying to do contrasts after applying a binomial mixed effect model > with the function lmer. I have to extract the fix effect values, but as I > write fixef(model), I get this error message: > > Error in UseMethod("fixef") : > no method for 'fixef' with objects of class "mer" > > Has anybody some ideas why? And how can I then post-hoc testing my data if I > cannot do the contrasts? > > Thank you very much
The most likely answer is that you have loaded another package that interferes with the lme4 package, most likely nlme. For example: library(lme4) ## CRAN version, or use lme4.0 from r-forge example(lmer) ## to generate some fitted values fixef(fm1) ## works library(nlme) ## produces warning about masking "The following objects ..." fixef(fm1) ## gives your error detach("package:nlme") fixef(fm1) ## works again other possible culprits are the glmmADMB package, or other packages that depend on (and hence automatically load) nlme. See sessionInfo() ... Questions like this are probably more suited to the r-sig-mixed-models list. Ben Bolker ______________________________________________ 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.