karen2020-07-05 13:07:57
老师您好,equity原版书527页example9第一问,关于第五点constraint on active risk具体指security within sector还是各个sector之间收益率的active risk? 答案如下图,第一句解释不明白,请问这是一个结论吗?谢谢
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Kevin2020-07-06 10:03:35
同学你好!
这道题还是要回到定义。Active return is defined as the portfolio return minus the benchmark return. Active risk is the annualized standard deviation of active returns。也就是整个portfolio的active risk。
回到你的问题,这句话的意思还是得看题干。原文是这么说的:The security weightings within sectors can be significantly different from those of the benchmark, but the portfolio’s sector weightings adhere closely to the benchmark weights. 也就是板块权重原本偏离基准不大,个股很大,因此在满足constraint的前提下,板块可以有更大的偏离程度,个股则更少。这题是这个意思
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