CONSISTENT ESTIMATION OF ZERO‐INFLATED COUNT MODELS
CONSISTENT ESTIMATION OF ZERO‐INFLATED COUNT MODELS
ABSTRACT 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 misspecification. This article proposes Poisson quasi‐likelihood estimators as an alternative. These estimators are consistent in the presence of excess zeros without having to specify …