Thank's for your help Peter! This post is really very informative. It helped a lot!
2012/3/27 Peter Ehlers <ehl...@ucalgary.ca> > On 2012-03-27 15:11, Ben Bolker wrote: > >> Lívia Dorneles Audino<livia.audino<at> gmail.com> writes: >> >> >>> I'm trying to make a glmm to identify the relationship between insect >>> species richness with fragment size, isolation and time (different >>> years). >>> I already tried to analyse it using poisson distribution error, but I >>> always face with the following warning: >>> *glm.fit: fitted probabilities numerically 0 or 1 occurred * >>> >>> This is probably hapenning because my dataset has a lot of zeros. So, >>> what >>> error distribution should I use? >>> >>> >> I know you haven't gotten a lot of help on r-sig-mixed-models (sorry), >> but it would probably be better to post this question there. The answer >> is that this is a warning, not an error, so it indicates a need for >> caution but not necessarily that anything is wrong. In this case, >> an internal call to glm.fit() has difficulty when it tries to fit >> a subset of that data that are all-zero or all-one. It's quite possibly >> OK, provided that you've looked at your results, plotted predicted values, >> etc., and everything seems to make sense. >> >> > Livia: > You might also find this quite extensive recent post from Ted Harding > informative: > > > https://stat.ethz.ch/**pipermail/r-help/2012-March/**307352.html<https://stat.ethz.ch/pipermail/r-help/2012-March/307352.html> > > Peter Ehlers > > > ______________________________**________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help> > PLEASE do read the posting guide http://www.R-project.org/** > posting-guide.html <http://www.R-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- *Lívia Dorneles Audino* Doutoranda em Entomologia Laboratório de Ecologia e Conservação de Invertebrados Universidade Federal de Lavras [[alternative HTML version deleted]]
______________________________________________ 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.
