| Variables | Model 1 HC1 | Model 2 HC2 | Model 3 PGap |
| AB | −0.0293*** | −0.0433*** | −0.0156*** |
| (0.0107) | (0.00442) | (0.00139) | |
| LN | −0.107** | −0.0568*** | −0.0130** |
| (0.0502) | (0.0208) | (0.00654) | |
| AL | −2.487*** | −1.003*** | −0.386*** |
| (0.387) | (0.160) | (0.0504) | |
| TR | 0.00259 | −0.395 | −0.147 |
| (0.390) | (0.161) | (0.0508) | |
| HE | −0.0688*** | −0.0544*** | −0.0173*** |
| (0.0249) | (0.0103) | (0.00324) | |
| FDI | 0.159 | 0.00861 | −0.00910 |
| (0.202) | (0.0836) | (0.0263) | |
| AGR | −0.447*** | −0.0453 | −0.00716 |
| (0.131) | (0.0543) | (0.0171) | |
| CPI | 0.00200** | 0.00156** | 0.000167** |
| (0.0011) | (0.00455) | (0.00143) | |
| POP | 0.447*** | 0.255*** | 0.0515** |
| (0.0167) | (0.0690) | (0.0217) | |
| EDU | −0.0121* | −0.370* | −0.106* |
| (0.0172) | (0.0195) | (0.0614) | |
| RPOP | 0.280 | 0.0722 | 0.00690 |
| (0.168) | (0.0697) | (0.0219) | |
| GDPPC | −0.0288*** | −0.0124*** | −0.00138*** |
| (0.0274) | (0.0113) | (0.00356) | |
| Constant | −21.55** | −15.03*** | −4.387*** |
| (8.314) | (3.440) | (1.082) | |
| Observations | 192 | 192 | 192 |
| F-test | 24.87*** | 19.51*** | 16.70*** |
| R-squared | 0.632 | 0.574 | 0.535 |
| Number of cid | 6 | 6 | 6 |