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poisson: Some convergence issues

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  • Santos Silva, Joao M C
  • Tenreyro, Silvana

Abstract

In this note we identify and illustrate some shortcomings of the poisson com- mand in STATA. Specifically, we point out that the command fails to check for the existence of the estimates and show that it is very sensitive to numerical problems. While these are serious problems that may prevent users from obtaining estimates, or even produce spurious and misleading results, we show that the informed user often has available simple work-arounds for these problems.

Suggested Citation

  • Santos Silva, Joao M C & Tenreyro, Silvana, 2011. "poisson: Some convergence issues," Economics Discussion Papers 3534, University of Essex, Department of Economics.
    • Handle: RePEc:esx:essedp:3534
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    References listed on IDEAS

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    1. 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.
    2. 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.
    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. 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.
    5. Rainer Winkelmann, 2008. "Econometric Analysis of Count Data," Springer Books, Springer, edition 0, number 978-3-540-78389-3, December.
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