R help - Feb 2001 - zero inflated poisson and censored-continuous models

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.

Georgina Bermann
Biostatistics
AstraZeneca R&D M?lndal
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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

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

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Georgina --

For the tobit you can try using the survival5 package with
dist="gaussian". Other options for dist make this attractive.

Cheers,
Dan
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-Dan Powers
Associate Professor, Sociology  
University of Texas at Austin                    


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.
> 
> Georgina Bermann
> Biostatistics
> AstraZeneca R&D Mölndal
>
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> r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
>
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> 
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Georgina,

There are a few packages that estimate parameters of a ZIP model. Try 
Emma Podlich's site at

                         http://www.maths.uq.edu.au/~hmp

(and see the Snews archive:  http://lib.stat.cmu.edu/s-news/Burst/13939)

James.


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.
> 
> Georgina Bermann
> Biostatistics
> AstraZeneca R&D M?lndal
>
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> r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !)  To: r-help-request at
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>
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> 
-- 
James McBroom :-)
Department of Statistics,     web: http://www.stats.ox.ac.uk/~mcbroom 
University of Oxford,         
1 South Parks Road,            ph: +44 (0)1865 272879
Oxford UK OX1 3TG.            fax: +44 (0)1865 272595


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James McBroom wrote:
> Georgina,
> 
> There are a few packages that estimate parameters of a ZIP model. Try  
> Emma Podlich's site at
> 
>                        http://www.maths.uq.edu.au/~hmp
> 
> (and see the Snews archive:  http://lib.stat.cmu.edu/s-news/Burst/13939)
> 
> James.

Apologies: That  should be Heather (not Emma) Podlich.

James.

-- 
James McBroom [:-)]
Department of Statistics,     web: http://www.stats.ox.ac.uk/~mcbroom
University of Oxford,        
1 South Parks Road,            ph: +44 (0)1865 272879
Oxford UK OX1 3TG.        fax: +44 (0)1865 272595

> 
> 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.
My fmr function in my gnlm library will do zeo-inflated Poisson models
available at www.luc.ac.be/~jlindsey/rcode.html
  Jim
> 
> Georgina Bermann
> Biostatistics
> AstraZeneca R&D M?lndal
>
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> Send "info", "help", or "[un]subscribe"
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>
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> 
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