Dear community, I am currently trying to fit an ordinal logistic regression model with the polr function. I often get the same error message :
"attempt to find suitable starting values failed", for example with : require(MASS) data(iris) polr(Species~Sepal.Length+Sepal.Width+Petal.Length+Petal.Width,iris) (I know the response variable Species should be nominal but I do as levels were ordered for the example). I think this is a likelyhood maximization problem ; I tried to solve this by setting the "start" option of polr to a null or a random vector by it doesn't garantee to find "a good" solution at the end. Does anyone have a clue ? Thanks a lot ! -- View this message in context: http://r.789695.n4.nabble.com/likelyhood-maximization-problem-with-polr-tp2528818p2528818.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.
