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

Table 3

Descriptive statistics of variables.

Variable	Obs.	Mean	Std. dev.	Min.	Max.
TFP	330	0.8993	0.4651	0.2677	4.0199
CER	330	3051.3230	3098.0430	153.3465	21040.9900
HER	330	5.4907	4.9187	0.1589	47.6962
VER	330	28377.6222	30159.0334	55.0000	214055.0000
HUM	330	8.6756	1.0074	6.3778	12.0650
FDI	330	2.4968	1.9238	0.0683	8.1914
FIN	330	2.6512	1.0183	1.2882	7.4898
STR	330	48.0251	7.6769	21.3000	61.5000
RD	330	1.3098	1.0193	0.1736	6.0800
RFIN	330	0.4963	0.2549	0.0289	1.7047