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 8 Heterogeneity analysis based on inner and outer cities of urban agglomeration

Variables	(1)	(2)	(3)	(4)	(5)	(6)
Variables	Inner city	Inner city	Inner city	Outer city	Outer city	Outer city
lnLQ_MAN	0.027			0.074
	(1.25)			(1.63)
lnLQ_PS8		0.052			0.111
		(1.56)			(0.73)
lnCOAG			0.115**			0.227
			(2.48)			(1.25)
lnPopDensity	− 0.012	− 0.012	− 0.012	− 0.005	− 0.004	− 0.004
	(− 1.01)	(− 0.99)	(− 0.99)	(− 0.51)	(− 0.37)	(− 0.43)
lnTaddSadd	− 0.044**	− 0.047**	− 0.043**	− 0.076*	− 0.100***	− 0.086**
	(− 2.03)	(− 2.17)	(− 2.00)	(− 1.92)	(− 3.24)	(− 2.40)
lnRegulation	0.595***	0.592***	0.600***	0.940***	0.951***	0.953***
	(4.57)	(4.53)	(4.59)	(4.59)	(4.54)	(4.61)
lnSciEdu	− 0.024	− 0.027	− 0.024	− 0.056**	− 0.059**	− 0.055**
	(− 1.05)	(− 1.20)	(− 1.04)	(− 2.16)	(− 2.19)	(− 2.12)
lnuF	− 0.011	− 0.010	− 0.011*	0.003	0.001	0.003
	(− 1.62)	(− 1.58)	(− 1.70)	(0.64)	(0.17)	(0.58)
Constant	1.066***	1.050***	0.954***	1.340***	1.322***	1.124***
	(4.95)	(4.93)	(4.47)	(4.38)	(4.24)	(3.23)
Observations	2170	2170	2170	1764	1764	1764
R-squared	0.448	0.448	0.449	0.360	0.359	0.360
Number of cities	155	155	155	126	126	126