[R] Zero inflated count models

Sundar Dorai-Raj sundar.dorai-raj at pdf.com
Sun Sep 21 18:26:24 CEST 2003

Dirk Enzmann wrote:

> Can someone show me how to specify zero inflated poisson and zero 
> inflated negative poisson models in R? I would like to replicate the 
> example given in Long (1997: Regression Models for Categorical and 
> Limited Dependent Variables) in Chapter 8.5 (pp. 242-247).
> Dirk


I believe this can be done with Jim Lindsey's fmr function in the gnlm 
package. The help page has an example of both ZIP and ZINB model fits.

The gnlm package can be downloaded from



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