[R] zero inflated poisson and censored-continuous models

Thomas Lumley tlumley at u.washington.edu
Wed Feb 7 17:25:55 CET 2001

On Wed, 7 Feb 2001 Georgina.Bermann at astrazeneca.com wrote:

> I wonder if there is a package that will estimate a Zero Inflated Poisson
> Model (ZIP), and also if there is a package that will estimate what is
> called the Tobit model: that is a combination of censored and observed
> values in the same sample.

I don't know about the ZIP, but I think tobit regression can be done with
survreg() in survival5. This allows observed and left- and right- censored
responses and one of the available distributions is "gaussian".


Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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