Research on the Influence of Emission Trading System on Enterprises' Green Technology Innovation

Table 2

Baseline regression.

Variable	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
	Poisson	Poisson	Poisson	Poisson	FE	FE	Poisson	FE
did	1.0583	1.0456	1.1184	1.3198	1.0600	0.8018	1.0702	0.8028
	(0.1745)	(0.5992)	(0.5945)	(0.4112)	(0.4802)	(0.4696)	(0.3699)	(0.4661)
Treat	−2.3330	−2.3368	−4.8667	−2.7290			−253.8961
	(0.1695)	(0.5531)	(0.7007)	(0.6465)			(215.0887)
Post	0.6713	0.1675	1.6287	0.9545	1.9215	2.2936	0.5313	2.2400
	(0.0446)	(0.9974)	(0.9917)	(0.5029)	(0.1087)	(0.6068)	(0.9280)	(0.8357)
Totalliability				0.1932		−0.0300	0.3198	−0.0414
				(0.0893)		(0.1203)	(0.1126)	(0.1229)
Netasset				0.3199		0.2089	0.1659	0.2204
				(0.0969)		(0.1783)	(0.1211)	(0.1770)
people_number				0.5855		0.3263	0.4930	0.3543
				(0.0698)		(0.1610)	(0.0774)	(0.1731)
tobin_q				0.1463		−0.0141	0.0041	−0.0143
				(0.2493)		(0.1474)	(0.2584)	(0.1422)
Age				−0.3659		−0.4484	−0.3506	−0.4496
				(0.1274)		(0.4182)	(0.1239)	(0.5057)
Time trend effect of provinces							Controlled	Controlled
Time trend effect of industries							Controlled	Controlled
Time fixed effect		Controlled	Controlled	Controlled	Controlled	Controlled	Controlled	Controlled
Region fixed effect			Controlled	Controlled	Controlled	Controlled	Controlled	Controlled
N	14120	14120	14120	13515	3700	3635	13515	3635
R2	0.0427	0.0652	0.2688	0.6462			0.6511