| 变量 | (1) | (2) | (3) | (4) |
| IND | Y | URB | Y | |
| HSR | 0.024*** |
|
|
|
|
| (0.000) |
|
|
|
| IND |
| 0.131*** |
| 0.006*** |
|
|
| (0.000) |
| (0.000) |
| URB |
|
| 0.384*** |
|
|
|
|
| (0.000) |
|
| 控制变量 | YES | YES | YES | YES |
| 个体效应 | YES | YES | YES | YES |
| 时间效应 | YES | YES | YES | YES |
| cons | 6.213*** | −0.658*** | 34.992*** | -0.072*** |
|
| (0.000) | (0.000) | (0.000) | (0.000) |
| N | 341 | 341 | 341 | 341 |
| R² | 0.588 | 0.812 | 0.683 | 0.900 |