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• W3126013864 abstract "Unconditional alphas are biased when conditional beta covaries with the market risk premium (“market-timing”) or volatility (“volatility-timing”). We demonstrate an additional bias (“overconditioning”) that can occur any time an empiricist estimates risk using information, such as a realized beta, that is not available to investors ex ante. Calibrating to U.S. equity returns, volatility-timing and overconditioning can plausibly impact alphas more than markettiming, which has been the focus of prior literature. To correct market- and volatility-timing biases without overconditioning, we show that incorporating realized betas into instrumental variables estimators is effective. Empirically, instrumentation reduces momentum alphas by 20-40%. Overconditioned alphas overstate performance by up to 2.5 times. We explain the sources of both the volatility-timing and overconditioning biases in momentum portfolios." @default.
• W3126013864 created "2021-02-01" @default.
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• W3126013864 date "2011-11-01" @default.
• W3126013864 modified "2023-09-23" @default.
• W3126013864 title "Conditional Risk and Performance Evaluation: Volatility Timing, Overconditioning, and New Estimates of Momentum Alphas" @default.
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• W3126013864 hasPublicationYear "2011" @default.
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