| (1) | (2) | (3) | (4) | |
| RD | RD | RD | RD | |
| Hedu | 1.015** | |||
| (2.41) | ||||
| Habroad | 2.811*** | |||
| (13.22) | ||||
| Heco | −0.624*** | |||
| (−2.67) | ||||
| H | 0.694*** | |||
| (6.68) | ||||
| LS | −0.0232*** | −0.0313*** | −0.0326*** | −0.0319*** |
| (−4.17) | (−14.07) | (−14.55) | (−14.27) | |
| Hedu_LS | −0.0201* | |||
| (−1.79) | ||||
| Habroad_LS | −0.0385** | |||
| (−2.47) | ||||
| Heco_LS | −0.00527 | |||
| (−0.30) | ||||
| H_LS | −0.0204*** | |||
| (−2.68) | ||||
| 控制变量 | 控制 | 控制 | 控制 | 控制 |