absolute difference in GDP pc
Bil Inv Treaty or Double Taxation Treaty in place
One country was colony of the other (Russia quasi-colonial master)
Common language
Dyad shares border or is <150 miles of water direct or via colony
Diplomatic representation (0: none; 1: unilateral; 2: in both countries)
bilateral visa restrictions in place
as dyad_bothvisa, but only in dyads both developing
as dyad_bothvisa, but only in dyads not both developing
unilateral visa restriction in place
as dyad_onevisa, but only in dyads both developing
as dyad_onevisa, but only in dyads not both developing
Both countries autocracies, Freedom House definition
Both countries democracies, Freedom House definition
ln of absolute difference in GDP pc
ln of population centre-weighted distance between countries
ln bilateral FDI stock
ln(bilateral migrantstock+1)
ln bilateral trade
Regional Trade Agreement dummy
Dyad located in the same region, WB classification