中国大城市病典型症状诱发因素的实证分析

中国大城市病典型症状诱发因素的实证分析

沈洁, 张可云

An empirical analysis of factors leading to typical urban problems in China

SHEN Jie, ZHANG Keyun

表4 门槛模型回归结果(资源短缺与环境污染)

Tab.4 Regression results of threshold model (resources shortage and environmental pollution)

变量	y₂						y₃
	scnd			thrd			scnd
	scnd≤0.417	scnd>0.417		thrd≤0.559	thrd>0.559		scnd≤0.467	scnd>0.467
size	-0.425^**	0.391^*		0.300^*	-0.441^**		0.255^**	0.816^***
	(0.160)	(0.188)		(0.169)	(0.170)		(0.122)	(0.113)
concen	0.017	0.067		0.032	0.122		0.422^**	0.227
	(0.196)	(0.124)		(0.143)	(0.078)		(0.142)	(0.146)
scnd	-1.015^***	-0.688^***		-0.292^***	-0.024		0.074	0.126^***
	(0.119)	(0.042)		(0.082)	(0.232)		(0.060)	(0.031)
thrd	-0.458^*	0.051		-0.924^***	-0.553^***		0.070	0.056
	(0.249)	(0.103)		(0.055)	(0.098)		(0.131)	(0.092)
road	-0.338^***	-0.217		-0.626^***	0.012		0.369^***	0.202
	(0.111)	(0.331)		(0.232)	(0.220)		(0.067)	(0.206)
bus	0.158^*	-1.461^***		-1.165^***	0.134		-0.259^***	0.255
	(0.102)	(0.423)		(0.341)	(0.113)		(0.051)	(0.283)
level	-0.148^***	-0.157^***		-0.142^**	-0.083		0.107^**	-0.100^**
	(0.067)	(0.067)		(0.062)	(0.056)		(0.045)	(0.045)
样本量	39	165		161	43		52	152
自由度	31	157		153	35		44	144
R²	0.668	0.314		0.366	0.373		0.533	0.327