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arXiv 1708.02424q-fin.PM
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基于因子模型的基数约束投资组合选择

Cardinality constrained portfolio selection via factor models

Juan Francisco Monge

摘要:

本文利用因子模型,提出并讨论了不同的0-1线性模型,以解决基数约束的投资组合问题。因子模型用于构建投资组合来跟踪指数,与其他目标一起,也需要比经典的Markowitz模型更少的参数来估计。基数约束的增加限制了投资组合中证券的数量。限制投资组合中证券的数量使我们能够获得集中的投资组合,降低风险并限制交易成本。为了解决这一问题,本文提出了一个纯0-1模型,该模型是通过分段线性逼近构造的。我们还提出了一个新的二次组合问题,称为最小边加权团问题,以获得一个等式加权基数约束的投资组合。在多因子模型的背景下,提出了一种分段线性逼近的方法。对于单因子模型,本文基于一些理论结果,提出了一种快速启发式算法,得到了一个等式加权基数约束的投资组合。分段线性近似的考虑,使我们能够显着减少所需的计算时间的等效二次问题。从0-1模型的计算结果进行比较,使用一个国家的最先进的二次MIP求解器。

英文摘要:

In this paper we propose and discuss different 0-1 linear models in order to solve the cardinality constrained portfolio problem by using factor models. Factor models are used to build portfolios to track indexes, together with other objectives, also need a smaller number of parameters to estimate than the classical Markowitz model. The addition of the cardinality constraints limits the number of securities in the portfolio. Restricting the number of securities in the portfolio allows us to obtain a concentrated portfolio, reduce the risk and limit transaction costs. To solve this problem, a pure 0-1 model is presented in this work, the 0-1 model is constructed by means of a piecewise linear approximation. We also present a new quadratic combinatorial problem, called a minimum edge-weighted clique problem, to obtain an equality weighted cardinality constrained portfolio. A piecewise linear approximation for this problem is presented in the context of a multi factor model. For a single factor model, we present a fast heuristic, based on some theoretical results to obtain an equality weighted cardinality constraint portfolio. The consideration of a piecewise linear approximation allow us to reduce significantly the computation time required for the equivalent quadratic problem. Computational results from the 0-1 models are compared to those using a state-of-the-art Quadratic MIP solver.

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