变量

(1)

(2)

(3)

lnmeg

−0.0179^**

(−2.17)

seg

0.0027^**

(2.53)

0.0029^**

(2.49)

lnstu

0.0238

(0.67)

0.0327

(0.93)

0.0292

(0.80)

lngov

0.5286^***

(23.16)

0.4993^***

(21.96)

0.5016^***

(20.72)

lnexpo

0.1326^***

(5.44)

0.1457^***

(6.03)

0.1468^***

(5.83)

lncap

−0.0081

(−0.56)

0.0011

(0.08)

0.0007

(0.05)

C

2.1088^***

(5.73)

2.3394^***

(6.38)

2.3997^***

(6.39)

N

468

468

468

R²

0.5983

0.6038

0.6195