变量

模型(1)

模型(2)

模型(3)

模型(4)

模型(5)

HL

3.043^**(2.12)

8.024^***

(2.75)

9.484^***

(3.03)

9.253^***

(3.11)

IL

−3.954^***

(−2.81)

−7.900^***

(−2.85)

−9.808^***

(−3.25)

−8.542^***

(−2.95)

HL²

−39.741^**

(−2.09)

−60.325^***

(−2.69)

−58.144^***

(−2.75)

IL²

30.038^*

(1.87)

46.437^**

(2.29)

38.425^**

(1.96)

HL × IC

6.202

(0.32)

IL × IC

−20.664

(−1.31)

HL² × IC

−117.107

(−1.10)

IL² × IC

131.874^*

(1.80)

HL × EU

−15.177^**

(−2.44)

IL × EU

14.445^**

(2.48)

HL² × EU

113.627^***

(2.82)

IL² × EU

−83.819^**

(−2.39)

CONTROLS

YES

YES

YES

YES

YES

F

2.50^**

2.12^**

1.85^**

2.87^***

1.71^**

R²

0.0113

0.0181

0.0172

0.0173

0.0179

N

1525

1525

1525

1525

1525

YEAR

YES

YES

YES

YES

YES

IND

YES

YES

YES

YES

YES