| Type | Variable | Description | Source |
|---|---|---|---|
| Dependent variable | Trade amount | Export amount, import amount, trade amount | KITA |
| Independent variable | GDP | Gross domestic product | World Bank |
| PERGDP | GDP per capita | World Bank | |
| Exchange rate | Exchange rate of currencies | OECD | |
| International oil price | International oil price | OECD | |
| Tariff rate | Average tariff rate of each country | WTO | |
| Dummy variable | FTA | Whether the FTA has been made or not | MoTIE |