| (1) | (2) | (3) | (4) | |
|---|---|---|---|---|
| x | y | x | y | |
| x | 0.786*** (7.183) | 0.601*** (13.701) | ||
| Ivroad | 91.086*** (5.101) | |||
| Ivpm | -0.643*** (-12.653) | |||
| c1 | -41.756*** (-2.090) | -19.718 (-1.626) | 37.400*** (2.112) | -27.804*** (-2.968) |
| c2 | -0.108*** (-4.752) | 0.010 (0.566) | -0.062*** (-3.202) | -0.012 (-1.033) |
| c3 | 0.016*** (3.182) | 0.002 (0.563) | 0.014*** （3.371） | 0.005** (2.017) |
| c4 | 0.151*** (2.856) | -0.037 (-0.868) | 0.139*** (3.973) | 0.026 (1.128) |
| Anderson LM 统计值 | 24.146*** | 101.697*** | ||
| Cragg-Donald F 统计值 | 26.027 | 160.125 | ||
| N | 300 | 300 | 300 | 300 |
