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

Table 5

Heterogeneity of enterprise scale and region.

Variable	(1)	(2)	(3)	(4)	(5)
	Large-scale	Small-scale	Eastern region	Central region	Western region
did	1.4500	0.0573	1.6855	−2.1302	1.1579
	(0.6421)	(0.4309)	(0.4209)	(1.1566)	(0.8925)
Treat	−2.8513	−2.0659	−2.4403	2.7855	0.7730
	(0.8735)	(0.8250)	(0.4436)	(1.3797)	(0.8881)
Post	0.8186	3.2583	0.9163	17.5341	1.6934
	(0.4803)	(0.7003)	(0.5235)	(1.2225)	(0.7598)
Control variable	Controlled	Controlled	Controlled	Controlled	Controlled
Time fixed effect	Controlled	Controlled	Controlled	Controlled	Controlled
Region fixed effect	Controlled	Controlled	Controlled	Controlled	Controlled
N	7043	6693	8312	3364	1839
R^2	0.6645	0.1299	0.6878	0.2144	0.2978