紫同学2018-01-16 20:48:51
An analyst has made the following return projections for each of three possible outcomes with an equal likelihood of occurrence: Asset Outcome 1 (%) Outcome 2 (%) Outcome 3 (%) Expected Return (%) 1 12 0 6 6 2 12 6 0 6 3 0 6 12 6 34. If the analyst constructs two-asset portfolios that are equally weighted, which pair of assets provides the least amount of risk reduction? A. Asset 1 and Asset 2. B. Asset 1 and Asset 3. C. Asset 2 and Asset 3. 原版书课后题,看了答案讲解,还是不明白,麻烦老师帮忙讲解一下。
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金程教育顾老师2018-01-17 09:48:13
学员你好,两两组合有三种组合,1和2,2和3,1和3,1和2组合三个outcome分别是(12,3,3),2和3组合三个outcome分别是(6,6,6),1和3组合outcome分别是(6,3,9),risk reduction效果最差的,就是方差最大的,(12,3,3)的方差是(12-6)^2+(3-6)^2+(3-6)^2=54,(6,3,9)的方差是(6-6)^2+(3-6)^2+(9-6)^2=18,所以outcome为(12,3,3)的组合的risk reduction的效果最差.
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呵呵,好晕啊,这种题,考试的时候,1.5分钟,做不出来啊。完全懂了,谢谢顾老师。


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