|
| (1) | (2) | (3) | (4) |
| 变量 | SYN1 | SYN2 | SYN1 | SYN2 |
| Treat*Post | −0.140*** | −0.105*** |
|
|
|
| (−5.10) | (−4.39) |
|
|
| DataAsset1 |
|
| −0.043** | −0.045*** |
|
|
|
| (−2.54) | (−3.13) |
| Controls | 控制 | 控制 | 控制 | 控制 |
| Ind、Year | 控制 | 控制 | 控制 | 控制 |
| N | 19,820 | 19,820 | 10,793 | 10,793 |
| R-squared | 0.350 | 0.371 | 0.341 | 0.360 |