Modeling the Impact of Innovation on Economic Quality and Environmental Pollution Change under Consideration of Environmental Regulation

Table 3

The threshold effect test of environmental regulation.

Explained variable	Model	Threshold	F value	value	BS times
GTFP	Single threshold	0.8498	12.83	0.357	300
	Double threshold	0.8591	20.15	0.09	300
		0.8631
	Three thresholds	0.8967	4.2	0.6	300
TFP	Single threshold	0.6173	19.01	0.12	300
	Double threshold	0.5955	84.6	0.33	300
		0.6073
	Three thresholds	0.7241	13.57	0.42	300
Industrial sulfur dioxide emissions	Single threshold	0.5444	84.89	0	300
	Double threshold	0.5444	25.62	0	300
		0.7136
	Three thresholds	0.4864	22.02	0.433	300
Industrial smoke and dust emissions	Single threshold	0.5007	1.19	0.7367	300
	Double threshold	0.5293	1.22	0.7311	300
		0.5373
	Three thresholds	0.4011	0.57	0.81	300
Industrial wastewater discharge	Single threshold	0.9116	6.78	0.433	300
	Double threshold	0.8692	9.13	0.21	300
		0.8591
	Three thresholds	0.8498	6.81	0.353	300

Note: , , and represent that the estimated coefficients are significant at the 10%, 5%, and 1% confidence levels, respectively.