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I have combined the two variables and this seems to fix this problem. When I run the log linear regression, I obviously get a coefficient for the constant. But I am looking for the natural log of the constant ln(A) as shown above in the second equation. So should I take the log of this constant? or ...

Tij = A ((Yi^a)(Yj^b))/Dij^c ln (Tij) = ln (A) + a [ln (Yi) + ln (Yj)]-cln(Dij) Tij = Imports Yi = GDP_Exporter Yj = GDP_Importer Dij = Total_Distance_Between I want to estimate the coefficients ln(A), a=b and c. France is the exporter in each case, so the GDP_exporter remains the same. How can I ge...

Hi, I am trying to run a trade gravity regression of the form log_imports c log_gdp_exporter log_gdp_importer log_distance I want the coefficient on log_gdp_exporter and log_gdp_importer to be the same for simplicity. I do not know how to combine these two. Even when I just run this regression as wr...