Improvement of Different Types of Environmental Regulations on Total Factor Productivity: A Threshold Effect Analysis

Table 4

Test of the threshold number.

Number of thresholds	Single-threshold test		Double-threshold test
Variable	F value	value	F value	value
LnHUM_CER	6.2009	0.7239	5.7638	0.4099
LnFDI_CER	11.5065	0.0010	6.8572	0.1372
LnFIN_CER	10.8875	0.0180	7.4002	0.1269
LnHUM_HER	4.7482	0.8022	3.6372	0.8686
LnFDI_HER	23.9921	0.0192	10.3323	0.2077
LnFIN_HER	19.8430	0.0971	9.5211	0.3493
LnHUM_VER	21.9506	0.0417	12.9106	0.1001
LnFDI_VER	5.0145	0.3420	3.5217	0.6014
LnFIN_VER	4.6089	0.1021	2.9403	0.3027