Thanks
Pscl seems to be a sensible option. 


I have the counts variable with the name "N". This variable can only take values bigger than zero!

I have two explanatory variables with the names "type" and "diam"

but when I run 


hpm <- hurdle(n ~ type+diam, data = an, dist = "poisson")

I get the message "invalid dependent variable, minimum count is not zero". Well, I know that N>0, that is why want to run a zero-truncated model. But I must be missing something...and the manual does not seem to help a lot...


Can anyone help please?

 
Dr. Iasonas Lamprianou
Department of Social and Political Sciences
University of Cyprus


>________________________________
>From: Mitchell Maltenfort <mmalten@gmail.com>
>To: Iasonas Lamprianou <lamprianou@yahoo.com>; "r-help@r-project.org" <r-help@r-project.org>
>Sent: Sunday, 31 July 2011, 20:45
>Subject: Re: [R] zero truncated poisson regression
>
>Pscl package.
>
>On 7/31/11, Iasonas Lamprianou <lamprianou@yahoo.com> wrote:
>> Dear friends,
>>
>> does anyone know how I can run a zero truncated poisson regression using R
>> (or even SPSS)?
>>
>> Dr. Iasonas Lamprianou
>> Department of Social and Political Sciences
>> University of Cyprus
>>
>>     [[alternative HTML version deleted]]
>>
>>
>
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