[Joao Santos Silva]

Those numbers are not comparable so they do not tell us much.

[Sofiene Mahjoubi]

Dear Joao Santos Silva
how to get result of panel data by country in stata (sort by country)??

[Joao Santos Silva]

Sorry, I am afraid I do not understand the question.

[Susan Jain]

Does PPML address endogeneity issues?

[Joao Santos Silva]

There are ways to deal with endogeneity in the context of PPML estimation.

[Gabriel Kwenda]

Dear Joao,

For the gravity model using PPML command.

I ran a gravity model for agricultural exports with regressors including digital dynamics on top of the traditional regressors like the GDP, population, and distance. I am also interested in running a time series model for the drivers of digital dynamics (mobile cellular subscription, percentage of internet users etc). But am worried about the problem of endogeneity. What are the ways I can use to deal with endogeneity in the context of PPML estimation?

Gabriel

[Joao Santos Silva]

Dear Gabriel Kwenda,

It looks as if you are not including any fixed effects in your model and in that case you can use ivpoisson or ivppml (which you can download from my webpage).

Best wishes,

Joao