Exploring the Classification and Restructuring of Chemical Industrial Cities in China: The Perspectives of Sectoral and Spatial Differences

Table 1

Definitions and descriptions of variables and their 2013 statistics.

Variable	Abbreviation (unit)	Description (unit)	Min	Max	SD
Resource conditions	RES	1 for cities with oil or coal, and 0 for cities without oil or coal	0	1	0.23
Port conditions	POR	Water freight traffic volume (10,000 tons)	0	46,697	1,641.2
Geographic location	GEO	1 for cities along the sea or the Yangtze River, and 0 for cities far from the sea or the Yangtze River	0	1	0.27
Foreign investment	FDI	Proportion of foreign investment in the chemical industry (%)	0	88.64	11.82
Investment in science and technology	TEC	Proportion of science and technology expenditure in the fiscal expenditure (%)	0.46	12.31	2.99
Market demand	MAR	Population of the city (10,000 person)	20	3,358.4	446.79
Environmental regulations	REG	Industrial sulfur dioxide removal rate (%)	0.10	99.83	62.00

SD = standard deviation.