Abstract
The mean-variance problem introduced by Markowitz in 1952 is a fundamental model in portfolio optimization up to date. When cardinality and bound constraints are included, the problem becomes NP-hard and the existing optimizing solution methods for this problem take a large amount of time. We introduce a core problem based method for obtaining upper bounds to the mean-variance portfolio optimization problem with cardinality and bound constraints. The method involves performing eigendecomposition on the covariance matrix and then using only few of the eigenvalues and eigenvectors to obtain an approximation of the original problem. A solution to this approximate problem has a relatively low cardinality and it is used to construct a core problem. When solved, the core problem provides an upper bound. We test the method on large-scale instances of up to 1000 assets. The obtained upper bounds are of high quality and the time required to obtain them is much less than what state-of-the-art mixed integer softwares use, which makes the approach practically useful.
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We acknowledge the Eastern African Universities Mathematics Programme and the International Science Programme at Uppsala University, for financial support.
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Mayambala, F., Rönnberg, E., Larsson, T. (2016). Tight Upper Bounds on the Cardinality Constrained Mean-Variance Portfolio Optimization Problem Using Truncated Eigendecomposition. In: Lübbecke, M., Koster, A., Letmathe, P., Madlener, R., Peis, B., Walther, G. (eds) Operations Research Proceedings 2014. Operations Research Proceedings. Springer, Cham. https://doi.org/10.1007/978-3-319-28697-6_54
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DOI: https://doi.org/10.1007/978-3-319-28697-6_54
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