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PPML: Stata module to perform Poisson pseudo-maximum likelihood estimation


  • J.M.C. Santos Silva

    () (University of Surrey)

  • Silvana Tenreyro

    (London School of Economics)


ppml estimates Poisson regression by pseudo maximum likelihood. It differs from Stata's poisson command because it uses the method of Santos Silva and Tenreyro (Santos Silva, J.M.C. and Tenreyro, S., 2010, On the Existence of the Maximum Likelihood Estimates in Poisson Regression, Economics Letters, 107(2), pp. 310-312. ) to identify and drop regressors that may cause the nonexistence of the (pseudo-) maximum likelihood estimates. It is described in the Stata Journal, 11:2, 2011.

Suggested Citation

  • J.M.C. Santos Silva & Silvana Tenreyro, 2015. "PPML: Stata module to perform Poisson pseudo-maximum likelihood estimation," Statistical Software Components S458102, Boston College Department of Economics.
  • Handle: RePEc:boc:bocode:s458102
    Note: This module should be installed from within Stata by typing "ssc install ppml". Windows users should not attempt to download these files with a web browser.

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    poisson; regression; pseudo-ML;


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