Dr. Flom,
I was searching the web for any examples of one-inflated negative binomial regression, and ran across your post.  Fittingly, I am working on the analysis of data from the NIDA Cooperative Agreement where I had the pleasure of working with Sherry Deren and other folks at NDRI.  NBR does a poor job of modeling number of sex partners.  (I am using Stata.)  Did you have any luck modeling a one-inflated negative binomial?

Brian Weir
Program Design & Evaluation Services
Multnomah County Health Department

bweir@pcez.com
brian.w.weir@state.or.us

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