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

Table 6

Threshold effect test of the lag term.

Explained variable	Model	Threshold valve	F value	value	BS times
GTFP	Single threshold	0.8512	15.44	0.3167	300
	Double threshold	0.8595	12.22	0.22	300
		0.8631
	Three thresholds	0.8924	3.82	0.5633	300
TFP	Single threshold	0.6144	25.48	0.003	300
	Double threshold	0.5985	76.32	0.33	300
		0.6103
	Three thresholds	0.8595	10.63	0.92	300
Industrial sulfur dioxide emissions	Single threshold	0.6258	140.16	0	300
	Double threshold	0.6258	75.57	0.02	300
		0.8206
	Three thresholds	0.4864	42.09	0.7833	300
Industrial smoke and dust emissions	Single threshold	0.5009	1.2	0.7067	300
	Double threshold	0.4014	−0.27	1	300
		0.5432
	Three thresholds	0.8370	0.56	0.79	300
Industrial wastewater discharge	Single threshold	0.8112	5.31	0.4767	300
	Double threshold	0.8048	16.56	0.0067	300
		0.8112
	Three thresholds	0.831	16.21	0.3233	300

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