Table 4 Basic gravity model
Variables | OLS | OLS | PPML | PPML |
|---|---|---|---|---|
LnGDPi | 0.852*** (0.02) | 0.953*** (0.02) | 0.489*** (0.03) | 0.732*** (0.03) |
LnGDPj | 0.899*** (0.01) | 1.008*** (0.02) | 0.785*** (0.03) | 0.827*** (0.03) |
LnPCGDPD | 0.192*** (0.02) | 0.296*** (0.02) | 0.305*** (0.03) | 0.156*** (0.03) |
LnDIS | − 0.905*** (0.07) | − 1.326*** (0.08) | − 0.272*** (0.06) | − 0.563*** (0.08) |
contig | 1.613*** (0.08) | 1.431*** (0.08) | 0.993*** (0.12) | 0.687*** (0.09) |
Comlang | 1.813*** (0.09) | 1.513*** (0.10) | 1.003*** (0.09) | 0.719*** (0.07) |
Constant | − 20.719*** (0.61) | − 22.391*** (0.62) | − 12.876*** (1.24) | 49.012*** (22.71) |
Year fixed effect | Yes | Yes | ||
Exporter fixed effect | Yes | |||
Importer fixed effect | Yes | |||
Observations | 4195 | 4195 | 4759 | 4759 |
R-square | 0.645 | 0.673 | 0.688 | 0.852 |
Adj. R-square | 0.645 | 0.671 |