Variable | 模型1 | 模型2 | 模型3 | 模型4 | 模型5 |
RD | 0.838*** (20.098) | 0.156* (1.348) | 0.833*** (19.037) | 0.954*** (53.578) | 0.104* (1.761) |
PPI | 0.964*** (3.325) | 1.007*** (3.622) | 0.979*** (3.371) | 0.867*** (2.960) | 0.680*** (2.824) |
INNO × RD | 0.175*** (3.025) |
|
|
|
|
MAR × RD |
| 0.088*** (6.973) |
|
|
|
RDP × RD |
|
| 0.125*** (2.984) |
|
|
HUM × RD |
|
|
| 0.007 (0.431) |
|
FIN × RD |
|
|
|
| 0.704*** (14.859) |
Constant | 0.114*** (3.807) | 0.119*** (4.167) | 0.115*** (3.846) | 0.101*** (3.370) | 0.082*** (3.336) |
Observations | 476 | 476 | 476 | 476 | 476 |
R-squared | 0.869 | 0.879 | 0.869 | 0.867 | 0.909 |