[Joao Santos Silva]

I am sorry, Niluka, but I do not have a lot of experience with that command; please check the help file.

Best wishes,

Joao

[NILUKA PERERA EKANAYAKE]

Dear Prof. Joao Santos Silva,

Thank you for your reply. I checked the help file too. Still, I'm unable to find an answer.

Kind regards
Niluka

[Amani Smith]

Hello everyone,

I hope you are doing well. I am new to this site.

I am interested in estimating the impact of income inequalities within countries on bilateral trade flows within a group of countries. It appears that the "ppmlhdfe" command in Stata is currently ideal for estimating the gravity model. However, it is not surprising that using this command leads to the omission of importer and exporter inequality variables. I understand that these variables are unilateral and are likely collinear with the exporter-time, importer-time, and exporter-importer fixed effects.

Since I am interested in the coefficients of these variables, could you please provide recommendations for a high-quality estimation?

Thank you.