組合標準差計算? - 基金
By Daniel
at 2011-02-04T23:05
at 2011-02-04T23:05
Table of Contents
假設有A B 兩個基金
配重為0.5 0.5
相關係數為0
A的標準差為 28%
B的標準差為 26%
用公式算出來 組合標準差為
( (0.5*28%)^2 + (0.5*26%)^2 )^(1/2) = 19.1%
請問這樣算有錯嗎?
因為我對結果感到很疑惑
算出來的值竟然不是在AB之間,而是小於AB的標準差
這讓我覺得很困惑
--
配重為0.5 0.5
相關係數為0
A的標準差為 28%
B的標準差為 26%
用公式算出來 組合標準差為
( (0.5*28%)^2 + (0.5*26%)^2 )^(1/2) = 19.1%
請問這樣算有錯嗎?
因為我對結果感到很疑惑
算出來的值竟然不是在AB之間,而是小於AB的標準差
這讓我覺得很困惑
--
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基金
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