错误概率 r1 fs(x) f2(x) m 错误概率(S)=「J(x S,= fs2(x)dx ●平均错误概率 P=B31(S2)P(S1)+P32(S1)P(S2) (S,)L. fs(x)dx+P(S2) fs2(x)dx错误概率 ⚫ 错误概率 ⚫ 平均错误概率   = VT PS (S ) f S (x)dx 1 2 1 − = V S S T P (S ) f (x)dx 2 1 2  −  = + = + V S V S e S S T T P S f x dx P S f x dx P P S P S P S P S ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1 1 2 2 1 2 1 2 1 2