[R-sig-eco] hurdle in package pscl

[Gavin Simpson]

On Wed, 2010-09-15 at 10:19 +0200, Yingjie Zhang wrote:
> Hey everyone,
> 
> I need to make sure of how 'hurdle' from package 'pscl' estimating the
> count part.
> 
> in the Code, we may use the command dist='poisson', does it estimate
> the count part by normal poisson or specially zero truncated poisson?
> 
> Any one has idea?

The latter; a left truncated Poisson at Y= 1. Which you could have found
yourself if you'd read the Vignette that comes with the pscl package :

http://cran.r-project.org/web/packages/pscl/index.html

See section 2.2.

HTH

G

> Best,
> Liv
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