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| Pool OLS | Fixed Effects | Random Effects | |||
| Explanatory variables | Coef. | P > |t| | Coef. | P > |t| | Coef. | P > |z| |
| Constant | −3.5798 | 0.059 | −9.933 | 0.586 | −4.3004 | 1.137 |
| log(GDPi∙GDPj) | 1.3046 | 0.000 | 1.7959 | 0.44 | 1.2808 | 0.000 |
| log(PCGDPDij) | 1.6262 | 0.000 | 1.2442 | 0.717 | 1.7387 | 0.001 |
| log(Distanceij) | −2.0127 | 0.000 | (dropped) | (dropped) | −2.0306 | 0.000 |
| Comlang_off | 0.2288 | 0.110 | (dropped) | (dropped) | 0.1665 | 0.490 |
| Colony | 0.1981 | 0.476 | (dropped) | (dropped) | 0.2692 | 0.585 |
| R2 | 0.7685 | 0.6837 | 0.7680 | |||
| R2adj | 0.7597 |
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