[R] glmmpql and lmer keep failing

[Roel de Jong]

Hello,

I'm running a simulation study of a multilevel model with binary 
response using the binomial probit link. It is a random intercept and 
random slope model.  GLMMPQL and lmer fail to converge on a 
*significant* portion of the *generated* datasets, while MlWin gives 
reasonable estimates on those datasets. This is unacceptable. Does 
anyone has similar experiences?

Regards,
	Roel de Jong