Dear All, I am trying to model the habitat mapping of 4 sharks species and my data are zero inflated and positively skewed. The zero percentages in my data vary between 56-77%. I did some tests fitting GAMs with negative binomial family (with theta between 1-10). Is this the best way to go? Some people have used VGAM (with zero inflated negative binomial) but my concern is that using the VGAM model I would lose the basic ecological assumption (e.g. if the habitat is not suitable your species is not there = 0 abundance).
Thank you very much in advance for any suggestions! Kind Regards, Valentina [[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.