SDM (1)

SDM (2)

SDM (3)

个体固定

时间固定

双固定

digital

0.011**

0.079***

0.011**

(1.36)

(6.53)

(1.37)

lnpgdp

0.191*

0.335***

0.237**

(1.82)

(6.43)

(2.18)

fdi

0.007***

0.014***

0.008***

(4.21)

(4.48)

(4.50)

edu

−0.012

−0.005

−0.008

(−1.60)

(−0.69)

(−1.09)

gov

−0.001

−0.003***

0.000

(−1.28)

(−6.45)

(0.10)

W*digital

0.006*

0.092*

0.047*

(0.21)

(1.70)

(1.32)

W*lnpgdp

0.069

−0.042

1.888***

(0.32)

(−0.12)

(3.36)

W*fdi

0.007

0.007

0.005

(1.55)

(0.64)

(0.64)

W*edu

−0.034**

−0.117***

−0.054

(−2.09)

(−3.21)

(−0.85)

W*gov

−0.003

0.002

0.016**

(−1.17)

(0.48)

(2.27)

ρ

0.265**

−0.130

0.369**

(1.74)

(−0.54)

(1.54)

σ²

0.001***

0.004***

0.001***

(11.59)

(12.44)

(11.63)

R²

0.663

0.738

0.717

Log-L

625.392

652.551

638.861

N

270.000

270.000

270.000