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arXiv 2604.28124q-fin.RM
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衡量风险或减少它,这是个问题:风险测量对于风险减少是必要的吗?

Measuring the risk or reducing it, that is the question: is risk measurement necessary for risk reduction?

University of Milano-Bicocca(米兰比可卡大学)

Pierpaolo Uberti

AI总结:

本文提出通过矩阵谱分析实现风险减少,无需依赖风险测量,通过识别高风险情景并降低投资敞露来降低风险,实验证明其有效性。

摘要:

本文从广泛接受的风险定义出发,支持风险减少比风险最小化更现实。通过推广矩阵的数值秩和条件数,提出基于回报矩阵谱分析的方法,直接对有限风险情景排序。通过实验证明,该方法能有效降低风险,同时保持平均收益和夏普比率。

英文摘要:

In this research, starting from a widely accepted definition of risk, we support the idea that risk reduction is a more realistic objective than risk minimization, which represents a theoretical utopia. Furthermore, significant risk reduction can be achieved without relying on risk measurement and risk minimization. To this end, we propose a generalization of the numerical rank and the condition number of a matrix, specifically the return matrix in this application. This generalization considers the entire matrix spectrum instead of focusing only on the smallest eigenvalue, as the condition number does. The approach directly provides an order among a finite number of risky scenarios. Risk reduction is obtained by identifying the riskiest scenarios and reducing investment exposures corresponding to them. The validity of this theoretical proposal is supported by a comprehensive experiment performed on real data. The capacity of the proposed approach to effectively reduce risk is proven by measuring the variability of out-of-sample returns for benchmark portfolios-constructed by minimizing standard risk measures-compared to the strategy of reducing exposure in high-risk scenarios. Finally, preventing large losses with limited active management-thereby controlling the impact of transaction costs-not only reduces risk but also preserves the average return and, consequently, the portfolio's Sharpe ratio.

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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