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Thank you for your answer. It's the case in gravity model of exports between pairs of countries, the GDP, population... varies over time and cross section but the distance is constant over the time and there are dummy variables too which doesn't vary over time. I don't really know how to deal with t...

Hey, Please how can I run hsiao test to see the heterogeneity of the model.

Hey, I'm estimating a gravity model (exports between countries), I have variables which vary over time and cross section (GDP, POP...) and I have constant variables distance between two countries for example. When I add these constant variable and I run fixed effect I get an error message "near...

Hey, you faced this problem in 2010 and i have the same problem today, I do a model of exports and when i run fixed effect it doesn't work prbably because of the constant variables (distance and dorders) what is the solution? how can i solve this?