Dear Statalisters

I am trying to do a Tobit regression for a sample with multiple firms in 30 different countries.
My question is: are there any option that allow me to run the regression using the weight of the sample of each country?
In other words, for example, I would like that if USA have 15,000 observations, Japan 10,000 observations and Brazil 2,000 observations, the regression could have in consideration that differences of the sample in each country for the estimation.

Hope to be clear with my question.

Thank you very much for any help.

Best regards,

Alejandro