变量

(1)

(2)

(3)

(4)

回归结果

直接效应

间接效应

总效应

lnisu

0.299

0.268

0.351^**

0.619^**

(0.240)

(0.258)

(0.299)

(0.301)

lngdp

0.0822

0.0817

−0.0811

0.000622

(0.0744)

(0.0659)

(0.0631)

(0.0869)

lnei

1.010^***

1.004^***

0.0773^*

1.082^***

(0.0339)

(0.0386)

(0.0420)

(0.0444)

lnopen

0.0166

0.0204

−0.0249^*

−0.00450

(0.0135)

(0.0141)

(0.0134)

(0.0217)

lnurban

−0.243

−0.279

0.0607

−0.218

(0.166)

(0.176)

(0.174)

(0.310)

lntech

0.0174

0.0218

−0.0148

0.00708

(0.0385)

(0.0367)

(0.0486)

(0.0714)

W × lnisu

0.375^**

(0.306)

W × lnei

0.211^**

(0.107)

W × lnopen

−0.0228^*

(0.0132)

sigma2_e

0.00183^***

(0.000316)

R²

86.3%