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poisson: Some convergence issues

Author

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  • J. M. C. Santos Silva

    (University of Essex and Centre for Applied Mathematics and Economics)

  • Silvana Tenreyro

    (London School of Economics, Department of Economics)

Abstract

In this article, we identify and illustrate some shortcomings of the poisson command in Stata. Specifically, we point out that the command fails to check for the existence of the estimates, and we show that it is very sensitive to numerical problems. While these are serious problems that may prevent users from obtaining estimates or may even produce spurious and misleading results, we show that the informed user often has simple workarounds available for addressing these problems. Copyright 2011 by StataCorp LP.

Suggested Citation

  • J. M. C. Santos Silva & Silvana Tenreyro, 2011. "poisson: Some convergence issues," Stata Journal, StataCorp LP, vol. 11(2), pages 215-225, June.
    • Handle: RePEc:tsj:stataj:v:11:y:2011:i:2:p:215-225
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    References listed on IDEAS

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    1. J. M. C. Santos Silva & Silvana Tenreyro, 2006. "The Log of Gravity," The Review of Economics and Statistics, MIT Press, vol. 88(4), pages 641-658, November.
    2. Manning, Willard G. & Mullahy, John, 2001. "Estimating log models: to transform or not to transform?," Journal of Health Economics, Elsevier, vol. 20(4), pages 461-494, July.
    3. Santos Silva, J.M.C. & Tenreyro, Silvana, 2010. "On the existence of the maximum likelihood estimates in Poisson regression," Economics Letters, Elsevier, vol. 107(2), pages 310-312, May.
    4. Rainer Winkelmann, 2008. "Econometric Analysis of Count Data," Springer Books, Springer, edition 0, number 978-3-540-78389-3, January.
    5. Gourieroux, Christian & Monfort, Alain & Trognon, Alain, 1984. "Pseudo Maximum Likelihood Methods: Applications to Poisson Models," Econometrica, Econometric Society, vol. 52(3), pages 701-720, May.
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