[R] zero truncated poisson regression

[Ben Bolker]

Mitchell Maltenfort <mmalten <at> gmail.com> writes:

> 
> Pscl package.
> 
  I'm not sure pscl will do zero-truncated (alone, as opposed to
as part of a hurdle model) regression.  countreg (on r-forge),
as pointed out in the previous response, should work.  Also
see ?Pospois in the VGAM package, or define your own "dztpois()"
function for the zero-truncated poisson and use it in mle2
(in the bbmle package).