i literally just ran one. when i ran one of mine and the did summary(mod) i get the following:
> mod <- lmer(dem ~ xbar + cpi + (1 | country), data=wvsAB) > summary(mod) Linear mixed model fit by REML Formula: dem ~ xbar + cpi + (1 | country) Data: wvsAB AIC BIC logLik deviance REMLdev 34383 34418 -17187 34355 34373 Random effects: Groups Name Variance Std.Dev. with a bunch more stuff below. On Mar 27, 2013, at 10:00 PM, Ben Bolker wrote: > Michael Grant <michael.grant <at> colorado.edu> writes: > >> >> >> Dear Help: > >> I am trying to follow Professor Bates' recommendation, quoted by >> Professor Crawley in The R Book, p629, to determine whether I should >> model data using the 'plain old' lm function or the mixed model >> function lmer by using the syntax anova(lmModel,lmerModel). >> Apparently I've not understood the recommendation or the proper >> likelihood ratio test in question (or both) for I get this error >> message: Error: $ operator not defined for this S4 class. > > I don't have the R Book handy (some more context would be extremely > useful! I would think it would count as "fair use" to quote the > passage you're referring to ...) > >> Would someone be kind enough to point out my blunder? > > You should probably repost this to the r-sig-mixed-mod...@r-project.org > mailing list. > > My short answer would be: (1) I don't think you can actually > use anova() to compare likelihoods between lm() and lme()/lmer() > fits in the way that you want: *maybe* for lme() [don't recall], > but almost certainly not for lmer(). See http://glmm.wikidot.com/faq > for methods for testing significance/inclusion of random factors > (short answer: you should *generally* try to make the decision > whether to include random factors or not on _a priori_ grounds, > not on the basis of statistical tests ...) > > 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. [[alternative HTML version deleted]] ______________________________________________ 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.
