importer code
industry code
time period
1 for contiguity
1 for common official of primary language
1 if a language is spoken by at least 9% of the population in both countries
1 for pairs ever in colonial relationship
comlang_ethno*(1-comlang_off)
ln(real bilateral outward stocks of FDI)
ln(sum of bilateral real GDP)
ln(1-[exp. GDP/(exp.+imp. GDP)]^2- [exp. GDP/(exp.+imp. GDP)]^2)
ln(real capital stock of exporter/real capital stock of importer)
ln(secondary school enrol. of exporter/secondary school enrol. of importer)
ln(labor force of exporter/labor force of importer)
ln(bilateral distance between exporter and importer)
|lrk|*lgdt
(lrk-lrl)*ldist