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).
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