just want to ask the following> > question:
> > > probit<-glm(y1~x1+x2-1,
> > family=binomial(link=probit))
> > Warning message:
> > fitted probabilities numerically 0 or 1 occurred
in:> > glm.fit(x = X, y = Y,
> > weights = weights, start = start, etastart > > etastart,
> > why does that happen?