Research Article
Optimizing Intermodal Transport and Hub Location Problem for ECOWAS in the Context of Improving Intra-African Trade
Table 3
Summary coefficients on gravity model estimates.
| Variables | Coef. | Std. Err. | Sig |
| LN (GDPGDP) | 0.9810841 | 0.0065849 | | LN (PopPop) | 0.0069167 | 0.0059408 | | LN (ABS (GDP-GDP) | −0.0050114 | 0.0065017 | | LN (Distance) | −0.1599074 | 0.0590544 | | LN (CPI + CPI) | −0.2225097 | 0.0903401 | | LN (PI + PI) | 0.0005157 | 0.0166238 | | Common language | 0.0001123 | 0.0013987 | | No. of obs | | 3,900 | | Adj R-Squared | | 0.9247 | |
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Note., , and show the level of significance at 10%, 5%, and 1%, respectively. |