The Comparison and Modeling of the Driving Factors of Urban Expansion for Thirty-Five Big Cities in the Three Regions in China

Table 1

Statistics summary of driving factors of urban expansion in 1990–2010 in China.

Indices	Mean	Maximum	Minimum	Standard deviation	Unit of the original data
Population increment, POPI	0.0363	1.1179	−0.5988	0.0930	×10^4 people
GDP increment, GDPI	0.2649	12.3755	0.0031	0.8213	×10^4 Chinese Yuan
Investment increment in capital construction, IICC	0.3161	11.5065	−1.0000	0.6782	×10^4 Chinese Yuan
Salary increment per capita, SIPC	0.1773	5.0539	−0.2027	0.2323	Chinese Yuan
Road increment, RI	0.1331	15.0575	−1.0000	0.6301	Km
Secondary industry product increment, SIPI	0.2579	13.5273	−0.1803	0.8531	×10^4 Chinese Yuan
Tertiary industry product increment, TIPI	0.3006	11.6330	−0.1599	0.8738	×10^4 Chinese Yuan
Electricity consumption increment, ECI	0.1103	2.3965	−0.6664	0.1789	×10^4 kwh