Modelling Excess Zeros in Count Data: A New Perspective on Modelling Approaches

@article{Haslett2021ModellingEZ,
  title={Modelling Excess Zeros in Count Data: A New Perspective on Modelling Approaches},
  author={John Haslett and Andrew C. Parnell and John P. Hinde and Rafael Andrade Moral},
  journal={International Statistical Review},
  year={2021},
  volume={90},
  pages={216 - 236}
}
We consider the analysis of count data in which the observed frequency of zero counts is unusually large, typically with respect to the Poisson distribution. We focus on two alternative modelling approaches: over‐dispersion (OD) models and zero‐inflation (ZI) models, both of which can be seen as generalisations of the Poisson distribution; we refer to these as implicit and explicit ZI models, respectively. Although sometimes seen as competing approaches, they can be complementary; OD is a… 

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