(1)

(2)

(3)

(4)

DID

0.042^***

0.046^***

0.048^***

0.052^***

(0.601)

(0.551)

(0.664)

(0.671)

CGDP

—

1.398^***

0.431^***

1.411^***

—

(0.032)

(0.04)

(0.028)

GOV

—

—

0.012^***

0.022^***

—

—

(0.244)

(0.178)

OFF

—

—

—

28.629^***

—

—

—

(7.432)

EDU

—

—

—

1.636^***

—

—

—

(0.803)

STR

—

—

—

−3.293

—

—

—

(2.298)

Constant

−1.521^***

−8.957^***

−5.672^***

−10.899^***

(6.154)

(6.213)

(5.430)

(1.472)

时间固定效应

YES

YES

NO

NO

地区固定效应

YES

NO

YES

NO

观测值

697

697

697

697

R²

0.722

0.734

0.731

0.736