Table 6.
Estimation results among four regions from 2006 to 2017.
| Explanatory variable | Eastern–Central | Eastern–Western | Eastern–Northeast | Central–Western | Central–Northeast | Weastern–Northeast |
|---|---|---|---|---|---|---|
| RTI | −0.012** (0.005) | −0.009 (0.011) | −0.006* (0.004) | −0.027*** (0.007) | −0.013* (0.008) | −0.015** (0.006) |
| P | 0.471*** (0.122) | −0.395*** (0.105) | −0.552*** (0.146) | −0.328*** (0.086) | −0.416*** (0.109) | 0.183*** (0.048) |
| Sigma2 | 0.022*** (0.006) | 0.007*** (0.002) | 0.024*** (0.006) | 0.016*** (0.004) | 0.015*** (0.004) | 0.009*** (0.002) |
*, **, and ***
represent the significance level of 10, 5, and 1%, respectively, and the data in brackets is standard deviation.