Research on the Impact of Environmental Regulation on Total Factor Energy Effect of Logistics Industry from the Perspective of Green Development

Table 7

Threshold effect test of each variable.

Variable	Threshold number	F-value	-value	Critical value			Threshold value
				1%	5%	10%
LnINV	A single threshold	38.77	0.0233	41.7595	33.6488	26.5382	5.0770
	Double threshold	16.75	0.2267	36.0620	28.2542	22.9746	6.3320
LnHUC	A single threshold	21.1	0.0267	24.6418	19.8401	16.3602	0.5741
	Double threshold	11.17	0.0633	21.5922	17.0186	13.6411	1.0395
LnLDL	A single threshold	24.87	0.0300	45.8900	32.8626	25.5656	2.2799
	Double threshold	16.94	0.0133	38.3564	28.2080	23.9518	2.4179

Note: is statistically significant at 1%, is statistically significant at 5%, and is statistically significant at 10%.