系数

模型

(1)

模型

(2)

模型

(3)

模型

(4)

模型

(5)

模型

(6)

模型

(7)

模型

(8)

I

0.634^***

(5.4800)

0.024

(1.5965)

0.006

(0.5374)

0.005

(0.4977)

0.001

(0.2034)

0.002

(0.2441)

0.002

(0.2382)

0.002

(0.2334)

E

−0.106^*

(−2.0527)

−0.005

(−0.2121)

−0.015 (−0.8481)

−0.016

(−0.8554)

−0.025

(−1.7105)

−0.024

(−1.6430)

−0.024

(−1.6264)

−0.023

(−1.5016)

SE

0.483^***

(5.4237)

−0.004

(−0.2695)

−0.016

(−1.3304)

−0.019

(−1.3284)

−0.005

(−0.3783)

−0.006

(−0.4074)

−0.006

(−0.3276)

−0.001

(−0.0759)

SR

0.035^***

(3.9240)

0.002

(0.8181)

0.003

(1.3068)

0.003

(1.2857)

0.004^*

(2.1306)

0.004^*

(2.1442)

0.004^*

(2.1089)

0.004^**

(2.2985)

P

0.161^***

(3.2560)

0.018

(1.3633)

0.004

(0.3804)

0.003

(0.2828)

0.010

(1.3870)

0.011

(1.2932)

0.011

(1.3015)

0.015^*

(1.8593)

IN

0.136^***

(4.2107)

0.134^***

(4.3753)

0.098^***

(6.7331)

0.095^***

(6.3597)

0.095^***

(5.5156)

0.088^***

(4.9631)

EX

0.024

(1.1338)

0.028

(1.6418)

0.029

(1.6699)

0.029^*

(2.0775)

0.029^*

(1.9951)

DE

0.418^***

(3.3946)

0.430^***

(3.1170)

0.430^***

(3.0451)

0.396^***

(2.6240)

PER

0.010

(0.9669)

0.010

(0.9763(

0.010

(0.9410)

EM

0.000

(0.0071)

−0.034

(−0.8738)

PAY

0.036

(1.2849)

GR

0.011

(1.0292)

Constant

2.773^***

(10.2255)

4.469^***

(36.7373)

4.054^***

(23.4743)

3.974^***

(22.7305)

2.162^***

(3.6558)

2.078^***

(3.1319)

2.077^***

(3.0085)

2.140^***

(3.1887)

Year FE

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

county FE

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Observations

70

70

70

70

70

70

70

70

R-squared

0.731

0.997

0.998

0.998

0.998

0.998

0.998

0.998