[R] Testing random effect in logistic mixed model

[Julien]

Hi
When using linear mixed model, I could test for the effect of the random
part of the model using a likelihood ratio test comparing two model with and
without the random part.

model.lmer=lmer(y~x+(1|r))
model.lm = lm(y~x)
anova(model.lmer,model.lm)

However, this does not work with a mixed model with binomial or poisson
distribution

> model.lmer = lmer(z~x+(1|r),family=binomial)
> model.glm =  glm(z~x,family=binomial)
> anova(model.lmer,model.glm)
 Erreur dans FUN(X[[1]], ...) : aucun slot de nom "call" pour cet objet de
la classe "glm"
	De plus : Warning message:
	arguments supplémentaires ignorés in: logLik.glm(X[[2]], ...)

My question is how cold I test for a random effect in logistic mixed model
because the anova function does not work here?

Thanks

Julien Martin

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