模型1

模型2

模型3

模型4

模型5

变量

Hqd

Hqd

Hqd

Hqd

Hqd

Digi

0.026***

0.027***

0.019***

0.019***

0.019***

(0.00)

(0.00)

(0.00)

(0.00)

(0.00)

lnpgdp

0.452***

0.353***

0.357***

0.262**

(0.09)

(0.07)

(0.07)

(0.12)

fdi

0.006***

0.006***

0.007***

(0.00)

(0.00)

(0.00)

edu

−0.009*

−0.009**

(0.00)

(0.00)

gov

−0.002

(0.00)

Constant

0.275***

−1.784***

−1.320***

−1.259***

−0.757

(0.00)

(0.43)

(0.31)

(0.32)

(0.58)

Observations

300

300

300

300

300

R-squared

0.795

0.822

0.835

0.836

0.837

Number of groups

30

30

30

30

30

area

YES

YES

YES

YES

YES

year

YES

YES

YES

YES

YES

F

717.9

247.4

2081

8257

955.8