John Sorkin <jsorkin <at> grecc.umaryland.edu> writes: > > windows Vista > R 2.10.1 > > What is the difference (or differences) between lme and lmer? Both appear to perform mixed effects > regression analyses. > Thanks > John >
in a nutshell: lmer is newer, much faster, handles crossed random effects well (and generalized linear mixed models), has some support for producing likelihood profiles (in the development version), and is under rapid development. It does not attempt to estimate residual degrees of freedom and hence does not give p-values for significance of effects. lme is older, better documented (Pinheiro and Bates 2000), more stable, and handles 'R-side' structures (heteroscedasticity, within-group correlations). r-sig-mixed-models is a good place for questions about these packages. 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.
