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Erscheinungsjahr: 
2014
Schriftenreihe/Nr.: 
Working Paper No. 151
Verlag: 
University of Zurich, Department of Economics, Zurich
Zusammenfassung: 
Excess zeros are encountered in many empirical count data applications. We provide a new explanation of extra zeros, related to the underlying stochastic process that generates events. The process has two rates, a lower rate until the first event, and a higher one thereafter. We derive the corresponding distribution of the number of events during a fixed period and extend it to account for observed and unobserved heterogeneity. An application to the socio-economic determinants of the individual number of doctor visits in Germany illustrates the usefulness of the new approach.
Schlagwörter: 
excess zeros
Poisson process
exposure
hurdle model
JEL: 
C25
I10
Persistent Identifier der Erstveröffentlichung: 
Dokumentart: 
Working Paper

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