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| Type | Working Paper |
| Scope | Discipline-based scholarship |
| Title | Consistent estimation of zero-inflated count models |
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| Institution | University of Zurich |
| Series Name | Working paper series / Socioeconomic Institute |
| Number | No. 0908 |
| Date | 2011 |
| Abstract Text | Applications of zero-inflated count data models have proliferated in health economics. However, zero-inflated Poisson or zero-inflated negative binomial maximum likelihood estimators are not robust to misspeci*fication. This paper proposes Poisson quasi-likelihood estimators as an alternative. These estimators are consistent in the presence of excess zeros without having to specify the full distribution. The advantages of the Poisson quasi-likelihood approach are illustrated in a series of Monte Carlo simulations and in an application to the demand for health services. |
| Official URL | http://www.econ.uzh.ch/wp.html |
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| Additional Information | Revised version |