变量

(1)

(2)

(3)

Y

Y

Y

Coverage breadth

−0.0006

(0.0048)

Usage depth

0.0046^**

(0.0021)

Digitization

0.0062^***

(0.0012)

lnGDP

−0.0161^***

−0.0187^***

−0.0208^***

(0.0038)

(0.0035)

(0.0034)

Foreign

−0.0099^**

−0.0108^**

−0.0132^***

(0.0042)

(0.0042)

(0.0040)

Is

0.0694^***

0.0623^***

0.0626^***

(0.0102)

(0.0100)

(0.0092)

Urb

−0.1554^***

−0.1436^***

−0.1325^***

(0.0229)

(0.0225)

(0.0214)

Edu

−0.4245^**

−0.3339^*

−0.3246^*

(0.1950)

(0.1975)

(0.1865)

Innov

3.1359^***

2.6989^***

2.4947^***

(0.4842)

(0.5128)

(0.4699)

(0.0135)

(0.0074)

(0.0053)

常数项

0.1891^***

0.2199^***

0.2338^***

(0.0478)

(0.0418)

(0.0390)

个体效应

YES

YES

YES

时间效应

YES

YES

YES

N

330

330

330

R²

0.952

0.953

0.956