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arXiv 2007.13972q-fin.PM
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分散风险和非对称尾部风险下的投资组合优化

Portfolio Optimization on the Dispersion Risk and the Asymmetric Tail Risk

Young Shin Kim

摘要:

在本文中,我们提出了一个市场模型,假设收益率服从多元正态回火稳定分布定义的多元正态分布和回火稳定从属的混合。这种分布能够捕捉到两个程式化的事实:肥尾和不对称性,这已经被经验观察到的资产收益率分布。在新的市场模型下,我们讨论了一种新的投资组合优化方法,它是Markowitz的均值方差优化方法的推广。新的优化方法不仅考虑了报酬和离散,而且考虑了非对称性。有效前沿也被推广到三维空间上的一个曲面上的奖励,分散和不对称。我们还提出了一个新的性能指标,这是一个扩展的夏普比率。此外,我们推导出封闭形式的解决方案的投资组合经理在投资组合建设中使用的两个重要措施:边际风险价值(VaR)和边际条件风险价值(CVaR)。我们说明了所提出的模型,包括道琼斯工业平均指数的股票。首先进行了新的投资组合优化,然后论证了在该模型下边际VaR和边际CVaR如何用于投资组合优化。基于本文提出的经验证据,我们的框架提供了现实的投资组合优化和易于处理的方法,投资组合风险管理。

英文摘要:

In this paper, we propose a market model with returns assumed to follow a multivariate normal tempered stable distribution defined by a mixture of the multivariate normal distribution and the tempered stable subordinator. This distribution is able to capture two stylized facts: fat-tails and asymmetry, that have been empirically observed for asset return distributions. On the new market model, we discuss a new portfolio optimization method, which is an extension of Markowitz's mean-variance optimization. The new optimization method considers not only reward and dispersion but also asymmetry. The efficient frontier is also extended to a curved surface on three-dimensional space of reward, dispersion, and asymmetry. We also propose a new performance measure which is an extension of the Sharpe Ratio. Moreover, we derive closed-form solutions for two important measures used by portfolio managers in portfolio construction: the marginal Value-at-Risk (VaR) and the marginal Conditional VaR (CVaR). We illustrate the proposed model using stocks comprising the Dow Jones Industrial Average. First, perform the new portfolio optimization and then demonstrating how the marginal VaR and marginal CVaR can be used for portfolio optimization under the model. Based on the empirical evidence presented in this paper, our framework offers realistic portfolio optimization and tractable methods for portfolio risk management.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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