A score test for testing a zero-inflated Poisson regression model against zero-inflated negative binomial alternatives.

M Ridout; J Hinde; C G Demétrio

doi:10.1111/j.0006-341x.2001.00219.x

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A score test for testing a zero-inflated Poisson regression model against zero-inflated negative binomial alternatives.

M Ridout·J Hinde·C G Demétrio

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Abstract

Count data often show a higher incidence of zero counts than would be expected if the data were Poisson distributed. Zero-inflated Poisson regression models are a useful class of models for such data, but parameter estimates may be seriously biased if the nonzero counts are overdispersed in relation to the Poisson distribution. We therefore provide a score test for testing zero-inflated Poisson regression models against zero-inflated negative binomial alternatives.

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M Ridout, J Hinde, C G Demétrio. 2001. A score test for testing a zero-inflated Poisson regression model against zero-inflated negative binomial alternatives.. https://doi.org/10.1111/j.0006-341x.2001.00219.x

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