To my knowledge, fixed and random effect models may be estimated for the logit model and only the random effect model for the probit model (because of the incidental parameter problem).
I think clogit in the survival package fits the model that is called the fixed effect logit model in the econometrics litterature. To my knowledge, there is currently no implementation ot the random effect model for probit and logit. Yves ______________________________________________ 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.