On Wed, 16 Sep 2009 12:55:43 -0400, James Hodson <[email protected]> wrote:
>Dear all, > >I've been searching for a while now for a package in R that can perform >mixed-model zero-inflated negative binomial regression. I am looking to >analyze pellet count data at the individual plot level, while accounting >for the fact that pellet plots are nested within sites and thus are not >strictly independent observations. I have a lot of zero counts, which is >why I'm interested in a zero-inflated model. I have tried the package >glmmADMB, but I have had no success in getting it to work with my data. >Any advice would be welcome. > Besides pscl, also VGAM. See Chapter 11 in Zuur et al (2009) for a 34-page discussion and examples. Mixed effects models and extensions in ecology with R. (2009). Zuur, AF, Ieno, EN, Walker, N, Saveliev, AA, and Smith, GM. Springer. http://www.springer.com/life+sci/ecology/book/978-0-387-87457-9 Sorry for refering to our won work..:-) Alain And doing it in RBugs is also easy.
