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黄石2024-03-05 15:18:34
同学你好。
Efficient frontier的定义需要牵扯到minimum variance frontier。英文:If the asset weights are appropriately selected, the resulting diversification can enable the optimization (i.e., minimization) of risk for any given level of returns. Plotting this results in the minimum variance frontier. If we further maximize returns for any given level of risk, we will obtain the efficient frontier, which is the positively sloped segment of the minimum variance frontier. 中文:从量化的角度来看,最小方差前沿其实是最优化的结果,即在给定组合的期望收益率的情况下最小化组合的风险。因此,该前沿上所有的点都是在同期望收益率下方差最小的组合。在最小方差前沿“给定期望收益率、最小化风险”的条件下再引入“给定风险、最大化期望收益率”的概念即可构成有效前沿。同时,有效前沿也定义了什么是“有效组合”。
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CML的定义需要牵扯到CAL。英文:free rate of return. The capital asset line (CAL) is a line drawn from the risk free rate and becomes the tangent to the efficient frontier. The tangent between the CAL and efficient frontier is the tangency portfolio. The capital market line (CML) is a particular CAL with market portfolio being the tangency portfolio. 中文:在由风险资产构成的有效前沿的基础上额外引入无风险资产,CAL即从无风险收益率出发、与有效前沿相切的线。资本资产线与有效前沿相切的点上的组合则被称为切点组合。CML是一条特殊的CAL,其切点组合为市场组合。
对于CAPM与APT模型,定义就是一种对资产进行定价的模型,记忆公式即可。SML则是CAPM的图像化。
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