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1、?n?1?qqpp pqpqrprqqpqqpprqrpqp)()(cPxxP?()()xP xP c forsomeelementc sqsrqprprpsqsrqp=KkkkppDE12log)(9142=k 1E(D)=0.940+pklog2log2pk(914514log251425E(D?)=0.971+log2(2535log235?35E(D?)=0.971+log2(3525log225?44E(D?)=0+log2(440?=ni 1Gain(D,A)E(D)E(Di)|Di|D|=0.2460.971(Gain(D,?)=0.9405140.971514+0+414=Kk
2、kkppDE12log)()()()P ABP A BP B=()()P ABP A=()P B A(|)()()P B A P AP B=()P A B()(|)0.6 0.001(|)0.006()1006 10000PPPP=?()(|)0.4 0.25(|)0.994()1006 10000PPPP=?()(|)?(|)0.833()6000 10000PPPP=?10000.4()(|)4000(|)0.167()6000 10000PPPP=?=?30.14143414P=?=P()|?10.04741434P=?=P()|?P?=0.50.141=0.0705=?=PP()|?P?=0.50.047=0.0235=?=PP()|(=)(=)PPPP=?(=)PPPP=?=()|=|?444(=)0.125888P?=