arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.07099math.OCq-fin.CPq-fin.MFq-fin.RM
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凸风险函数的逆Optimization

Inverse Optimization of Convex Risk Functions

Jonathan Yu-Meng Li

摘要:

凸风险函数的理论现在已经很好地建立起来,作为识别应用于风险厌恶最优化问题的风险函数族的基础。尽管其理论上的吸引力,凸风险函数的实施仍然是困难的,因为很少有关于如何选择凸风险函数的指导,使它也很好地代表自己的风险偏好。在本文中,我们通过逆优化的镜头来解决这个问题。具体而言,给定的解决方案数据,从一些(向前)风险厌恶的最优化问题,我们开发了一个逆优化框架,生成一个风险函数,使解决方案的最佳正向问题。该框架结合了凸风险函数的众所周知的属性,即单调性,凸性,平移不变性和定律不变性,作为候选风险函数的一般信息,以及来自个体的反馈,其中包括风险函数的初始估计和随机损失之间的成对比较,作为更具体的信息。我们的框架是特别新颖的,不像经典的逆优化,没有参数假设的风险函数,即它是非参数的。我们展示了如何得到的逆最优化问题可以重新表述为凸规划,是多项式可解的,如果相应的正问题是多项式可解的。我们举例说明了在投资组合选择问题中的估算风险函数,并使用实际数据证明了它们的实用价值。

英文摘要:

The theory of convex risk functions has now been well established as the basis for identifying the families of risk functions that should be used in risk averse optimization problems. Despite its theoretical appeal, the implementation of a convex risk function remains difficult, as there is little guidance regarding how a convex risk function should be chosen so that it also well represents one's own risk preferences. In this paper, we address this issue through the lens of inverse optimization. Specifically, given solution data from some (forward) risk-averse optimization problems we develop an inverse optimization framework that generates a risk function that renders the solutions optimal for the forward problems. The framework incorporates the well-known properties of convex risk functions, namely, monotonicity, convexity, translation invariance, and law invariance, as the general information about candidate risk functions, and also the feedbacks from individuals, which include an initial estimate of the risk function and pairwise comparisons among random losses, as the more specific information. Our framework is particularly novel in that unlike classical inverse optimization, no parametric assumption is made about the risk function, i.e. it is non-parametric. We show how the resulting inverse optimization problems can be reformulated as convex programs and are polynomially solvable if the corresponding forward problems are polynomially solvable. We illustrate the imputed risk functions in a portfolio selection problem and demonstrate their practical value using real-life data.

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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