William F. Sharpe Style Analysis - Jacobs Levy Center...2016/05/07 · William F. Sharpe Style...
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William F. SharpeStyle Analysis
May 20, 2016
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A Multi-factor Model
Factors:
Returns on mutually exclusive and exhaustivemarket capitalization-weighted portfolios
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U.S. Stock Indices
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Barra U.S. Stock Index Performance
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Regression Analysis
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Regression Analysis with a Constraint
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Quadratic Programming
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“An Algorithm for Portfolio Improvement”
Advances in Mathematical Programming and Financial Planning, 1987
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Asset Classes“Determining a Fund's Effective Asset Mix”
(Dec. 1988)
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In-sample R2 Values388 Pension Fund Manager Accounts
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Asset Classes“Asset Allocation: Management Style and Performance Measurement”
Winter 1992
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R2 = 89.0 %
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Mean: 0.18 %/mo Standard Deviation = 1.48 %/mo t(avg) = 0.84
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Mean: 0.57 %/mo Standard Deviation = 1.05 %/mo t(avg) = 3.76
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Mean = -0.074 %/mo (annualized: 0.888% /year)
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Style and Performance Analysis
l Performance in month t vs. Style at end of month t-2
l Out-of-sample R2 valuesl Style Analysis
-number of months utilized-exponential weighting of monthly observations
l Aggregate results for individual funds
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A Large Pension Fund
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Holdings-based vs. Returns-basedStyle Analysis Models
(from Morningstar website)
Holdings-based- Uses characteristics of underlying securities
Returns-based- More widely used among financial professionals, because the input data (monthly returns) is (sic) widely available
Morningstar has long been a proponent of holdings-based style analysis but recognizes that there may be situations where returns-based analysis can also be helpful.
The company's institutional research platform … combinesadvanced holdings-based and returns-based style analysis.
Ideally, practitioners should use both approaches.