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???????????????? ????? ?? ? 222222 l i ml i m MppMpnpne ?????? ???????? ?pMpp e2222 ???? ??? ? 22 ?? ?ie1018 Risk Reduction with Diversification Number of Securities St. Deviation Market Risk Unique Risk ?P2?M2 1019 The CAPM and Index Model ?CAPM: ?Index Model: ?① Actual returns vs. expected returns ?② rm ? ? ? ?? ?fMifi rrErrE ??? ?? ? ifMiifi errrr ????? ?a1020 The CAPM and Index Model ?③ index model ?The index model beta coefficient turns out to be the same beta as that of the CAPM expected returnbeta relationship. ?i= Cov(Ri, RM)/σ 2M iMiii eRR ??? ?a? ? ? ?? ? ? ?2,MiMiMMiMiMiMiReC o vRRC o vReRC o vRRC o v???? ?。健 ?????1022 Multifactor Models ?多因素模型的提出 系統(tǒng)風(fēng)險包括多種因素 不同的因素對不同的股票的影響力是不同的 對于 m個因素,證券 i的收益可以表示為 ?????mjijiji eFar1?? ? ? ?? ? kieeC o vFeC o veEkijii????,0,0,0其中,