买同学2022-02-21 20:46:34
老师这一段什么意思As long as none of the factors used in a factor-based VCV model are redundant and none of the asset returns are completely determined by the common factors, there will not be any portfolios that erroneously appear to be riskless. Therefore, a factor-based VCV matrix approach may result in some portfolios that erroneously appear to be riskless if any asset returns can be completely determined by the common factors or some of the factors are redundant.
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Nicholas2022-02-22 10:26:59
同学,早上好。
举例说明,假设当前的组合需要使用三个因子来解释组合回报,但现在使用单因子就会导致某些因子的风险敞口没有被解释,认为是无风险的。例如股票的回报需要用流动性、市场风险、规模来解释,解释的因子为市场风险,如果一些资产的市场风险较小,流动性风险较大,则可能导致该资产被认为是无风险资产; 假设当前的组合需要三个因子来解释组合回报,过多的因子解释力度会下降,甚至是没有用的,那么冗余的因子解释可能会导致某些资产被认为是无风险的资产。例如历史的组合中仅有三个资产,当前用六个资产的组合来解释过往组合,剩余的三个资产可能就会被认为是无风险资产。
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