The Impacts of Freight Trade on Carbon Emission Efficiency: Evidence from the Countries along the “Belt and Road”

Table 8

Robustness test results.

Variable	LCTCEI	LITCEI	LGTCEI	LBPR	LTGR
	(1e)	(2e)	(3e)	(4e)	(5e)
LIFT	0.0239	0.0882	0.0263	0.0865	–0.0343
	(0.0130)	(0.0212)	(0.0109)	(0.0218)	(0.0151)
LCTCEI	0.1367
	(0.2286)
LITCEI		0.7007
		(0.0868)
LGTCEI			0.6417
			(0.1187)
LBPR				0.6705
				(0.0815)
LTGR					0.0436
					(0.1819)
AR (2) value	0.2428	0.8028	0.114	0.5351	0.6821
Sargan value	0.2716	0.2524	0.1413	0.2581	0.2836
Control	Yes	Yes	Yes	Yes	Yes
Year	Yes	Yes	Yes	Yes	Yes
N	736	736	736	736	736

The parenthesis are the robust standard error values: , , and .