Perfect pred

[josef-pkt]

detect perfect prediction in Logit and Probit in a callback for the optimizer and raise an exception

[josef-pkt]

I don't like that we raise an exception and propagate it to the user without returning results.

I think the callback is useful and the exception there can stop the minimization that will go off to infinity until it hits maxiter or maximum function evaluation (maybe not in every optimizer).

One idea is to catch the state of the optimization, capture the exception in the callback and return the last results.

see #39 also discussions on the mailing list,

test case example was discussed in #66

[wesm]

Merged into master. A few rebase conflicts but I handled them carefully, don't think I screwed anything up