ppml: Number of regressors excluded

[Daniel Gomez]

Hi,

I am using the PPML estimator but I am not really sure what does it mean?:

"Number of regressors excluded to ensure that the estimates exist: 59"

I appreciate any suggestion.

[Joao Santos Silva]

In general you can ignore the messages, but please see:

• Santos Silva, J.M.C. and Tenreyro, Silvana (2011), poisson: Some Convergence Issues, STATA Journal, 11(2), pp. 207-212.
• Santos Silva, J.M.C. and Tenreyro, Silvana (2010), On the Existence of the Maximum Likelihood Estimates in Poisson Regression, Economics Letters, 107(2), pp. 310-312.

Joao

[Daniel Gomez]

Thank you Joao!