变量 | 模型(2) 数字金融变量、研发投入变量各滞后一期 L.RD | 模型(4) SA | 模型(5) L.RD |
L.DF-city | 0.331*** (6.414) | −0.019*** (−2.920) | 0.326*** (6.318) |
L.SA |
|
| −0.490*** (−2.610) |
Size | 0.793*** (35.858) | 0.046*** (16.620) | 0.809*** (35.325) |
Age | −0.000 (−0.098) | −0.041*** (−89.075) | −0.021** (−2.406) |
Lev | −0.329*** (−2.623) | −0.134*** (−8.502) | −0.390*** (−3.059) |
Top1 | −0.000 (−0.251) | 0.001*** (4.422) | 0.000 (0.027) |
Gov | 0.071*** (5.554) | 0.002 (0.981) | 0.071*** (5.629) |
常数项 | −2.216*** (−5.021) | −3.976*** (−71.506) | −4.011*** (−4.911) |
固定效应 | 控制 | 控制 | 控制 |
样本量 | 1878 | 1878 | 1878 |
R2 | 0.727 | 0.880 | 0.728 |