The Impact of Digital Economy on Industrial Carbon Emission Efficiency: Evidence from Chinese Provincial Data

Table 6

Robustness checks.

	Model (1)	Model (2)	Mode l(3)	Model (4)	Model (5)	Model (6)
Cons_	2.142^∗∗∗ (0.134)	2.140^∗∗∗ (0.133)	2.143^∗∗∗ (1.134)	2.144^∗∗ (1.131)	2.147^∗ (1.132)	2.241^∗∗∗ (1.136)
LnDigitalit	1.114^∗∗∗ (0.002)	1.142^∗∗∗ (0.004)	1.142^∗∗∗ (0.004)	1.117^∗∗∗ (0.003)	1.110^∗∗∗ (0.001)	1.102^∗∗∗ (0.001)
Lnfdiit		0.030^∗∗ (0.001)	0.040 (0.003)	0.043^∗∗∗ (0.001)	0.042^∗ (0.000)	0.038^∗∗∗ (0.002)
LnInvit			−0.072^∗∗ (0.022)	−0.074^∗ (0.019)	−0.075 (0.020)	−0.077^∗ (0.024)
LnExit				0.022 (1.001)	−0.065^∗∗ (1.012)	−0.063^∗∗ (1.005)
Lngdpit					0.651^∗∗∗ (0.001)	0.659^∗∗∗ (0.002)
LnGovit						0.191^∗∗ (0.012)
AR(1)	0.0412	0.0447	0.0413	0.0241	0.0341	0.0141
AR(2)	0.4204	0.1413	0.4042	0.1743	0.4131	0.4146
Sargan	0.3043	0.4211	0.3710	0.2041	0.4127	0.3514

Notes. Standard errors are shown in brackets; ^∗∗∗, ^∗∗ and ^∗, respectively, represent significance at 1%, 5%, and 10% levels.