Table 6 Robustness test results
Variables | Regression coefficient | |
|---|---|---|
Model 1 (α = 0.5) | Model 2 (α = 0.5) | |
X1 | – | – |
X2 | 7.110331e-02 | 7.077443e-02 |
X3 | – | – |
X4 | – | – |
X5 | 2.676738e-02 | 3.448887e-02 |
X6 | – | – |
X7 | 7.995698e-03 | – |
X8 | – | – |
X9 | – | – |
X10 | −5.939468e-05 | −4.327471e-05 |
X11 | – | – |
X12 | – | – |
X13 | 2.233790e-03 | – |
X14 | – | −1.093319e-06 |
X15 | – | −1.830648e-05 |
X16 | −1.781413e-06 | – |
X17 | 3.840092e-05 | 7.725741e-05 |
X18 | – | – |
X19 | – | – |
X20 | – | – |
Intercept | 7.593978e-03 | 9.623387e-02 |