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Estimation of hurdle models for overdispersed count data

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  • Helmut Farbmacher

    () (University of Munich, Germany)

Abstract

Hurdle models based on the zero-truncated Poisson-lognormal distribution are rarely used in applied work, although they incorporate some advantages compared with their negative binomial alternatives. I present a command that enables Stata users to estimate Poisson-lognormal hurdle models. I use adaptive Gauss–Hermite quadrature to approximate the likelihood function, and I evaluate the performance of the estimator in Monte Carlo experiments. The model is applied to the number of doctor visits in a sample of the U.S. Medical Expenditure Panel Survey. Copyright 2011 by StataCorp LP.

Suggested Citation

  • Helmut Farbmacher, 2011. "Estimation of hurdle models for overdispersed count data," Stata Journal, StataCorp LP, vol. 11(1), pages 82-94, March.
  • Handle: RePEc:tsj:stataj:v:11:y:2011:i:1:p:82-94
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    References listed on IDEAS

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    1. Rainer Winkelmann, 2004. "Health care reform and the number of doctor visits-an econometric analysis," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 19(4), pages 455-472.
    2. Allen McDowell, 2003. "From the help desk: hurdle models," Stata Journal, StataCorp LP, vol. 3(2), pages 178-184, June.
    3. Vuong, Quang H, 1989. "Likelihood Ratio Tests for Model Selection and Non-nested Hypotheses," Econometrica, Econometric Society, vol. 57(2), pages 307-333, March.
    4. Mullahy, John, 1986. "Specification and testing of some modified count data models," Journal of Econometrics, Elsevier, vol. 33(3), pages 341-365, December.
    5. A. Colin Cameron & Pravin K. Trivedi, 2010. "Microeconometrics Using Stata, Revised Edition," Stata Press books, StataCorp LP, number musr, April.
    6. J. M. C. Santos Silva, 2003. "A note on the estimation of mixture models under endogenous sampling," Econometrics Journal, Royal Economic Society, vol. 6(1), pages 46-52, June.
    7. Wong, Irene O.L. & Lindner, Michael J. & Cowling, Benjamin J. & Lau, Eric H.Y. & Lo, Su-Vui & Leung, Gabriel M., 2010. "Measuring moral hazard and adverse selection by propensity scoring in the mixed health care economy of Hong Kong," Health Policy, Elsevier, vol. 95(1), pages 24-35, April.
    8. Winfried Pohlmeier & Volker Ulrich, 1995. "An Econometric Model of the Two-Part Decisionmaking Process in the Demand for Health Care," Journal of Human Resources, University of Wisconsin Press, vol. 30(2), pages 339-361.
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