Table 8 Robustness test results.

From: Mechanism and spatial spillover effect of the digital economy on carbon emission efficiency in Chinese provinces

Variables

Substitute dependent variable

Alter measurement method

Exclude four direct-controlled municipalities

DE

0.982*** (6.37)

 

0.098*** (2.86)

DE2

 

0.411*** (3.03)

 

IC

0.204 (1.39)

− 0.146*** (− 3.19)

− 0.154*** (− 3.31)

UL

− 8.333*** (− 4.42)

− 0.140 (− 0.35)

− 0.496 (− 1.41)

OPE

0.067 (0.17)

0.382*** (3.26)

0.247** (2.39)

GOV

− 0.993* (− 1.71)

− 0.186 (− 1.04)

0.158 (1.11)

UGC

1.008 (0.91)

0.191 (0.51)

0.972*** (2.65)

HCL

− 26.205** (− 2.04)

3.351 (0.88)

− 1.616 (− 0.45)

Constant

4.416*** (3.97)

0.904*** (3.52)

0.769*** (3.45)

Year fixed

Y

Y

Y

Region fixed

Y

Y

Y

N

300

300

260

R2

0.627

0.455

0.655

  1. ***p < 0.01, **p < 0.05, *p < 0.1, t-statistics in parentheses.