变量 | 模型(1) Innovation | 模型(2) RD | 模型(3) Innovation |
DF-pro | 0.286*** (8.066) | 0.307*** (12.350) |
|
RD |
|
| 0.477*** (22.965) |
Size | 0.519*** (24.875) | 0.778*** (53.245) | 0.159*** (6.169) |
Age | −0.013*** (−3.644) | −0.006** (−2.533) | −0.005 (−1.531) |
Lev | 0.062 (0.542) | −0.443*** (−5.559) | 0.224** (2.080) |
Top1 | 0.002 (1.359) | −0.001 (−1.563) | 0.002 (1.564) |
Gov | 0.127*** (10.032) | 0.106*** (11.889) | 0.076*** (6.203) |
常数项 | −11.536*** (−29.133) | −2.069*** (−7.455) | −10.033*** (−28.262) |
固定效应 | 控制 | 控制 | 控制 |
样本量 | 4292 | 4292 | 4292 |
R2 | 0.420 | 0.696 | 0.478 |