变量 | (5) | (6) | (7) |
发展中国家 | 发达国家 | 所有国家 | |
lnEXP | lnEXP | lnEXP | |
lnGDP | 0.414*** | 0.705*** | 0.836*** |
| (0.113) | (0.0908) | (3.57) |
lnPOP | 0.477*** | 0.0518*** | 0.873*** |
| (0.104) | (0.0694) | (5.24) |
lnDIS | −0.701*** | −0.511*** | −0.688*** |
| (0.121) | (0.0695) | (−8.91) |
TFI | 2.934*** | 1.493** | 2.574** |
| (0.893) | (0.687) | (2.32) |
Constant | 9.420*** | 13.34*** | −137.601*** |
| (2.927) | (1.705) | (−4.60) |
Observations | 85 | 85 | 170 |
Number of country | 17 | 17 | 34 |
R-squared | 0.696 | 0.700 | 0.752 |
country FE | YES | YES | YES |
F test | 0 | 0 | 0 |
r2_a | 0.638 | 0.671 | 0.682 |
F | 410.1 | 382.4 | 100.0 |