R help - Sep 2003 - Zero inflated count models

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).

TIA
Dirk

*************************************************
Dr. Dirk Enzmann
Criminological Research Institute of Lower Saxony
Luetzerodestr. 9
D-30161 Hannover
Germany

phone: +49-511-348.36.32
fax:   +49-511-348.36.10
email: ENZMANN at KFN.uni-hannover.de

http://www.kfn.de

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).
> 
> TIA
> Dirk
> 
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

http://alpha.luc.ac.be/~jlindsey/rcode.html

-sundar