Vji. The
bilateral trade value in Vij and Vji will be the same however when
you run
the equation the explanatory variables will change (GDP, POP,
Tariff..).
Start with the bilateral trade data. Expand this dataset with
values Vij to
account for values Vji. Once you've done that merge the macro
variables
(GDP, POP, Tariff, etc.) taking country i as the reference one. You
will
have repeated macro variables for each observation of bilateral
trade per
country i per year.
If you want to take a look to a ready to estimate dataset of this
kind, let
me know and I will send you one.
I hope this helps,
Rafa
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