Hi,

I have a question:

Given this gravity model estimated with the PPML estimator with fixed effects:

TRADEijt = exp [πit + χjt + β1ln⁡(DISTij ) + β2CNTGij + β3LANGij + β4CLNYij + β5RTAijt ]x εijt

πit: The set of exporter-time fixed effects
χjt: The set of importer-time fixed effects


Is it possible to estimate the same model but using only the bilateral trade of one country?
For example, for Country A where TRADEijt is given by imports between Country A - j and imports between i - Country A

If yes, how could I define the sets of exporter and importer time fixed effects?

Thank you!