指标1与指标2间的夹角余弦 X1→(x1 n X,→x21 22 x2n X→x P 2 pn Ikk k: 12 2k k=1指标1与指标2间的夹角余弦    = = = = n k n k k k n k k k x x x x C 1 1 2 1 2 2 2 1 1 1 2 1 2 [( )( )]                                           p n n n p p x x x x x x x x x     2 1 2 2 2 1 2 1 2 1 1 1 , , , X1  X2  X p 