Research Article
Research on the Impact of Expressway on the County Economy Based on a Spatial DID Model: The Case of Three Provinces of China
Table 4
Parallel trend test results.
| Variables | Guangdong | Hubei | Qinghai |
| 3 years prior | −0.0447 (−1.61) | −0.0394 (−1.68) | −0.106 (−0.54) | 2 years prior | −0.015 (−0.41) | −0.0309 (−0.97) | 0.0372 (0.19) | 1 year prior | −0.00822 (−0.17) | −0.0401 (−1.25) | 0.099 (0.37) | Connect year | 0.0544 (1.20) | −0.0285 (−1.04) | 0.105 (0.41) | 1 year after | −0.0117 (−0.37) | −0.00143 (−0.05) | −0.105 (−0.54) | 2 years after | 0.0413 (1.29) | 0.000272 (0.01) | −0.155 (−1.16) | 3 years after | 0.0277 (0.96) | −0.00641 (−0.23) | −0.0496 (−0.74) | Constants | 14.41 (407.36) | 14.35 (385.88) | 12.22 (163.3) |
|
|
Note. for , for , and for ; t statistics in parentheses. |