and the Optimal Risky Portfolio
33
图7.8 Determination of the Optimal Overall Portfolio
34
图7.9 The Proportions of the Optimal Overall Portfolio
35
小结:两种风险资产与无风险资产 组合的配置程序
▪ Covariance and the correlation coefficient provide a measure of the way returns of two assets vary
7-7
Two-Security Portfolio: Return
w r w r rp
DD
EE
rP Portfolio Return
(1)给定收益的条件下,风险最小化 (2)给定风险的条件下,收益最大化
38
11 ... 1n
若已知资产组合收益c、方差 协方差矩阵
M
O
M 和
1n L nn
组合各个资产期望收益向量r=(r1, r2,..., rn )T,求解组合中资产权重
向量w=(w1, w2,..., wn ),则有
nn
30
图7.6 债券与股票基金的可行集和两条可 行的CALs
31
最优风险资产组合P的求解
Max wi
S
P
E(rP ) rf
P
s.t. E(rP ) wD E(rD ) wE E(rE )
P
[ wD2
2 D
wE2
2 E
2wDwECov(rD , rE )]1/ 2
wD wE 1