If you can prove that the Fisher information matrix is positive definite, the resulting estimate is MLE. Otherwise you can only claim it a local MLE (the Hessian matrix at the estimate is negative definite).
-- View this message in context: http://r.789695.n4.nabble.com/likelyhood-maximization-problem-with-polr-tp2528818p2530594.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
