Different types of industrial agglomeration and green total factor productivity in China: do institutional and policy characteristics of cities make a difference?

Environmental Sciences Europe

Table 6 Results of robustness test

Variables	(1)	(2)	(3)	(4)	(5)	(6)
lnLQ_MAN	0.043*			0.043*
	(1.90)			(1.70)
lnLQ_PS8		0.080			0.084
		(1.17)			(1.11)
lnCOAG			0.154**			0.155*
			(1.98)			(1.73)
lnPopDensity	− 0.009	− 0.009	− 0.009	− 0.012	− 0.011	− 0.012
	(− 1.10)	(− 1.03)	(− 1.06)	(− 1.23)	(− 1.18)	(− 1.20)
lnTaddSadd	− 0.062***	− 0.073***	− 0.065***	− 0.069***	− 0.080***	− 0.071***
	(− 2.68)	(− 3.68)	(− 2.89)	(− 2.72)	(− 3.73)	(− 2.86)
lnRegulation	0.680***	0.696***	0.691***	0.786***	0.797***	0.793***
	(6.05)	(6.14)	(6.14)	(6.64)	(6.70)	(6.71)
lnSciEdu	− 0.045**	− 0.047***	− 0.045**	− 0.035*	− 0.040**	− 0.035*
	(− 2.58)	(− 2.64)	(− 2.54)	(− 1.87)	(− 2.04)	(− 1.87)
lnuF	− 0.004	− 0.005	− 0.004	− 0.006	− 0.006	− 0.006
	(− 1.09)	.(− 1.14)	(− 1.10)	(− 1.42)	(− 1.48)	(− 1.39)
Constant	1.074***	1.081***	0.932***	1.263***	1.257***	1.113***
	(6.09)	(6.14)	(4.86)	(6.82)	(6.80)	(5.39)
Observations	3878	3878	3878	3612	3612	3612
R-squared	0.399	0.399	0.400	0.410	0.410	0.411
Number of cities	277	277	277	258	258	258