指标的归一化处理：
xij′=xij−min(x1j,⋯ ,xnj)max(x1j,⋯ ,xnj)−min(x1j,⋯ ,xnj)x’_{ij}=\frac{x_{ij}-min(x_{1j},\cdots,x_{nj})}{max(x_{1j},\cdots,x_{nj})-min(x_{1j},\cdots,x_{nj})}xij′=max(x1j,⋯,xnj)−min(x1j,⋯,xnj)xij−min(x1j,⋯,xnj)
第j项指标下第i个国家占该指标的比重：
pij
