Research Article
Is the High-Speed Rail Opening Environmentally Friendly? Taking the Difference-in-Differences Test in Jiangsu, China
Table 2
Basic regression results.
| | | (1) | (2) | (3) | (4) | (5) | (6) | | Goodday | Goodday | Goodday | Goodday | Goodday | Goodday |
| | G | 0.354
(0.032) | 0.184
(0.047) | 0.184
(0.047) | 0.189
(0.047) | 0.202
(0.046) | 0.215
(0.045) | | PGDP | — | −0.025
(0.018) | −0.029
(0.057) | −0.152
(0.087) | −0.136
(0.086) | −0.082
(0.086) | | PGDP2 | — | −2.47 × 10−11
(5.01 × 10−12) | −2.49 × 10−11
(5.36 × 10−12) | −3.2 × 10−11
(6.87 × 10−12) | −3.12 × 10−11
(6.79 × 10−12) | −3.88 × 10−11
(7.14 × 10−12) | | T3 | — | — | 0.004
(0.053) | −0.018
(0.054) | −0.025
(0.053) | −0.009
(0.052) | | PI | — | — | — | 0.235
(0.127) | 0.129
(0.131) | 0.059
(0.130) | | U | — | — | — | — | 0.552
(0.196) | 0.598
(0.193) | | FDI | — | — | — | — | — | −0.066
(0.022) | | Constant | 5.645
(0.012) | 5.946
(0.184) | 5.887
(0.771) | 5.442
(0.803) | 6.188
(0.833) | 5.700
(0.834) | | Time effect | Control | Control | Control | Control | Control | Control | | Urban effect | Control | Control | Control | Control | Control | Control | | Within R2 | 0.023 | 0.210 | 0.214 | 0.223 | 0.253 | 0.284 | | Samples | 234 | 234 | 234 | 234 | 234 | 234 |
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, , and indicate the level of significance through 1%, 5%, and 10%, respectively. |
