duan xian kao shou gan chang xian kao ce lve ding pan shi yi jian hen xin ku de shi you shi huan hui mi shi zai er yu wo zha de mai mai zi xun li he bu gen zhu ben yan jiu fang fa dang ge qing song de tou zi ren dang quan qiu shou dao ou zhai feng bao zhi ying xiang jia shang guo nei shi shi zheng suo shui zhi jia ji xia shi de tou zi gu piao geng jia kun nan ji shi nu li yan jiu ye chang duan yu er gui geng bie xiang shuo yao you chao e bao chou dan shi ru guo tou zi zai huo li wen ding qie gao gu xi de tou zi zu he shi zheng jie guo xia huo li yuan gao yu shi chang ping jun bao chou ben yan jiu shi yong 1952 nian Markowitz suo ti chu de ping jun shu bian yi shu tou zi zu he mo xing da pei R yu fa fen xi gong ju xing cheng tou zi zu he ke rang tou zi ren zai zuo tou zi jue ce shi zhao chu zui shi he zi ji de tou zi zu he fang fa shi zheng de zhi bu lun yi ge yue huo san ge yue Feasible Portfolio he Efficient Portfolio zai bao chou lv xiang tong de qing xing zhi xia tou zi zu he bi jiao biao zhun cha hou Efficient Portfolio de biao zhun cha jiao xiao yi wei zhu shi feng xian qu bi de tou zi zhe yi deng quan zhong fang fa lai xing cheng tou zi zu he shi tou zi zu he ke fen san de feng xian huan neng fen san yin ci tou zi zhe ke neng hui xuan ze ke yi ba feng xian fen san dai jin de Efficient Portfolio tou zi zu he you ci ke jian zi chan pei zhi de zhong yao xing yi tou zi ren ke cheng dan feng xian de cheng du lai shuo Tangency Portfolio shu yu gao feng xian qie gao bao chou jiao shi he feng xian ai hao zhe lai tou zi zhe fan zhi Minimum Variance Portfolio