解释变量

全国地区

东部地区

中部地区

西部地区

COVERAGE

−0.000982^***

0.0000474

−0.000277

−0.0020^***

(0.000337)

(0.000231)

(0.000274)

(0.000629)

USAGE

−0.000162

0.000355^***

−0.0000383

−0.00066^**

(0.000124)

(0.0000798)

(0.0000949)

(0.000268)

DIGIZATION

−0.000107^*

−0.000000581

−0.0000911^*

−0.00021^*

(0.000061)

(0.0000422)

(0.000058)

(0.000108)

LNURBAN

−2.843486^***

−3.088588^***

−2.49489^***

−3.265456^***

(0.100384)

(0.048183)

(0.202758)

(0.14689)

LNRGDP

0.234037^***

0.457351^***

0.201918^***

0.207237^***

(0.038925)

(0.016131)

(0.052874)

(0.068955)

OPEN

0.400603^***

0.872714^***

0.522758

1.046108^**

(0.118171)

(0.058792)

(0.36123)

(0.424263)

EDU

−0.037957^***

−0.143502^***

−0.003449

0.006718

(0.015216)

(0.014031)

(0.012073)

(0.02544)

IS

−0.370802

1.249495^***

−0.128062

−0.72187

(0.279422)

(0.073794)

(0.276321)

(0.485898)

LNFE

0.217732^***

0.4375^***

0.129388

0.191395^***

(0.03276)

(0.012727)

(0.048193)

(0.052017)

LNAFE

−0.000982^***

−0.243354^***

−0.012422^***

−0.120262^*

(0.000337)

(0.009464)

(0.033718)

(0.068053)

C

−0.000162^***

−6.232689^***

−1.956527

−2.00122^**

(0.000124)

(0.209336)

(0.695453)

(0.862892)

Individual fixed effects

No

No

Yes

No

Observations

185

66

48

71

R-squared

0.921861

0.909915

0.999168

0.965850