综合选择指数的估计 于是, 2520318.8 12.5263.75 8021300.8 A=6375512 sym 80 63.7551 A(PDI/) 0.5 25 D A(Ps21) 0.5 1.3 A(PE21)综合选择指数的估计 于是，           = 2 2 2 80 80 1300.8 25 0 318.8 sym V           = 2 2 2 63.75 51 63.75 51 12.5 63.75 A           =           = 1 0.5 0.5 ( ) ( ) ( ) 2 2 1 A P I A P I A P I E S D r r r D       =      = 1.3 25 2 1 w w w