Portfolio Optimization with Factors, Scenarios, and Realistic Short Positions
This paper presents fast algorithms for calculating mean-variance efficient frontiers when the investor can sell securities short as well as buy long, and when a factor and/or scenario model of covariance is assumed. Currently, fast algorithms for factor, scenario, or mixed (factor and scenario) mod...
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Published in | Operations research Vol. 53; no. 4; pp. 586 - 599 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Linthicum, MD
INFORMS
01.07.2005
Institute for Operations Research and the Management Sciences |
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Abstract | This paper presents fast algorithms for calculating mean-variance efficient frontiers when the investor can sell securities short as well as buy long, and when a factor and/or scenario model of covariance is assumed. Currently, fast algorithms for factor, scenario, or mixed (factor and scenario) models exist, but (except for a special case of the results reported here) apply only to portfolios of long positions. Factor and scenario models are used widely in applied portfolio analysis, and short sales have been used increasingly as part of large institutional portfolios. Generally, the critical line algorithm (CLA) traces out mean-variance efficient sets when the investors choice is subject to any system of linear equality or inequality constraints. Versions of CLA that take advantage of factor and/or scenario models of covariance gain speed by greatly simplifying the equations for segments of the efficient set. These same algorithms can be used, unchanged, for the long-short portfolio selection problem provided a certain condition on the constraint set holds. This condition usually holds in practice. |
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AbstractList | This paper presents fast algorithms for calculating mean-variance efficient frontiers when the investor can sell securities short as well as buy long, and when a factor and/or scenario model of covariance is assumed. Currently, fast algorithms for factor, scenario, or mixed (factor and scenario) models exist, but (except for a special case of the results reported here) apply only to portfolios of long positions. Factor and scenario models are used widely in applied portfolio analysis, and short sales have been used increasingly as part of large institutional portfolios. Generally, the critical line algorithm (CLA) traces out mean-variance efficient sets when the investor’s choice is subject to any system of linear equality or inequality constraints. Versions of CLA that take advantage of factor and/or scenario models of covariance gain speed by greatly simplifying the equations for segments of the efficient set. These same algorithms can be used, unchanged, for the long-short portfolio selection problem provided a certain condition on the constraint set holds. This condition usually holds in practice. This paper presents fast algorithms for calculating mean-variance efficient frontiers when the investor can sell securities short as well as buy long, and when a factor and/or scenario model of covariance is assumed. Currently, fast algorithms for factor, scenario, or mixed (factor and scenario) models exist, but (except for a special case of the results reported here) apply only to portfolios of long positions. Factor and scenario models are used widely in applied portfolio analysis, and short sales have been used increasingly as part of large institutional portfolios. Generally, the critical line algorithm (CLA) traces out mean-variance efficient sets when the investors choice is subject to any system of linear equality or inequality constraints. Versions of CLA that take advantage of factor and/or scenario models of covariance gain speed by greatly simplifying the equations for segments of the efficient set. These same algorithms can be used, unchanged, for the long-short portfolio selection problem provided a certain condition on the constraint set holds. This condition usually holds in practice. |
Audience | Trade |
Author | Levy, Kenneth N Jacobs, Bruce I Markowitz, Harry M |
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Cites_doi | 10.1111/j.1540-6261.1993.tb04764.x 10.1111/j.1540-6261.1976.tb03217.x 10.2469/faj.v54.n2.2164 10.1111/j.1540-6261.1981.tb04889.x 10.1287/mnsc.30.10.1143 10.1002/nav.3800030110 10.2469/faj.v49.n5.22 10.1016/0378-4266(94)00083-F 10.1086/294954 10.2307/1909468 10.3905/jpm.1999.319730 10.1287/mnsc.9.2.277 |
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Keywords | portfolio: optimization with short sales Covariance matrix Portfolio management Finance Optimization |
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References | B20 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B1 B2 B3 B4 B5 B6 B7 B8 B9 Jacobs Bruce I. (B6) 2000 Markowitz Harry M. (B13) 1987 Markowitz Harry M. (B17) 1992; 2 Markowitz Harry M. (B16) 2000 Fortune Peter (B4) 2000; 2000 Jacobs Bruce I. (B5) 1993; 49 Markowitz Harry M. (B15) 1981 Markowitz Harry M. (B12) 1959 |
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SubjectTerms | Algorithms Applied sciences Covariance Covariance matrices Exact sciences and technology Expected returns finance Financial portfolios Investors Management Margin requirements Mathematical optimization Methods Modeling Operational research and scientific management Operational research. Management science Portfolio management Portfolio theory portfolio:optimization with short sales Security portfolios Short sales |
Title | Portfolio Optimization with Factors, Scenarios, and Realistic Short Positions |
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