Symbol	Definition
A₁	GDP
A₂	The total amount of import and export
A₃	The total export
B₁	The city s population
B₂	The basic old age insurance number
B₃	Every one thousand people with health agency data
B₄	Professional and technical personnel
B₅	Urban built up area
B₆	The bus operating line the total length
B₇	Taxi operation vehicle
C₁	Built up area green area
C₂	Intensity of sulfur dioxide emissions per unit of GDP
C₃	Industrial waste water processing
	The ith object the jth index
	Weights
	Correlation coefficient