变量

(1)

(2)

(3)

(4)

回归结果

直接效应

间接效应

总效应

lnisu

0.0396

0.0497

−0.459^**

−0.409^**

(0.0899)

(0.0896)

(0.190)

(0.198)

lngdp

−0.117^***

−0.120^***

−0.0186^**

−0.138^***

(0.0285)

(0.0249)

(0.0308)

(0.0506)

lnei

0.928^***

0.930^***

0.00599

0.936^***

(0.0228)

(0.0246)

(0.0290)

(0.0375)

lnopen

0.0401^***

0.0409^***

−0.00261

0.0382

(0.0127)

(0.0139)

(0.0184)

(0.0248)

lnurban

0.0986^***

0.0905^**

0.0707^*

0.161^**

(0.0361)

(0.0408)

(0.0387)

(0.0808)

lntech

0.0398

0.0342^*

−0.0914

−0.0372

(0.0325)

(0.0312)

(0.0673)

(0.0831)

W × lnisu

−0.480^**

(0.195)

W × lngdp

−0.0212^***

(0.0223)

sigma2_e

0.00378^***

(0.000396)

R²

90.3%