anova (lm, lmer ) question

romunov <romunov at ...> writes:

FWIW, this is from the glmm faq site <http://glmm.wikidot.com/faq>.

How can I test whether a random effect is significant?

...

   - *do not* compare lmer models with the corresponding lm fits, or
   glmer/glm; the log-likelihoods are not commensurate (i.e., they include
   different additive terms)

For what it's worth, I believe this is out of date, _except_ for 
glmer fits with nAGQ>1.  It should be possible to implement
anova(<merMod>,<lm>/<glm>) -- it's only a nuisance (sadly, if we
were still using S4 classes at this level it would be easier ...)

  Ben Bolker