[R] Anova for GLMM (lme4) is a valid method?

[Douglas Bates]

Ronaldo Reis-Jr. wrote:
> Hi,
> 
> I try to make a binomial analysis using GLMM in a longitudinal data file.
> 
> Is correct to use anova(model) to access the significance of the fixed terms?
> 
> Thanks
> Ronaldo

 From lme4_0.95-1 on the GLMM function has been replaced by lmer with a 
non-missing family argument.  For the time being I would recommend 
staying with lme4_0.9-x and using the anova(model) from that but bear in 
mind that the Wald approximate tests are notoriously inaccurate for some 
generalized linear models and generalized linear mixed models.

If you have only a single level of random effects and you also have 
access to SAS I would suggest cross-checking the results against those 
from SAS PROC NLMIXED.  Getting better results for this calculation in 
lmer models is on my "To Do" list but there are a lot of other tasks 
above it.