Environmental Sciences Europe

Table 4 Solving the endogeneity problem

From: How does high-speed railway affect green technology innovation? A perspective of high-quality human capital

Variables	(1)	(2)
	IV-GMM	IV-GMM
	GTI_Quan	GTI_Qua
HSR	1.614***	2.981***
HSR	(3.34)	(3.49)
Observations	3,432	3,432
R-squared	0.496	0.300
Number of city code	286	286
Control variables	Yes	Yes
City FE	Yes	Yes
Time FE	Yes	Yes
Under identification test	0.000	0.000
Weak identification test	10.62	10.62
Hansen J statistic	0.620	0.556

Robust z-statistics in parentheses
^***p < 0.01, **p < 0.05, *p < 0.1

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