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CAPM Over the Long Run: 1926-2001

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Author Info
Andrew Ang
Joseph chen
Abstract

A conditional one-factor model can account for the spread in the average returns of portfolios sorted by book-to-market ratios over the long run from 1926-2001. In contrast, earlier studies document strong evidence of a book-to-market effect using OLS regressions in the post-1963 sample. However, the betas of portfolios sorted by book-to-market ratios vary over time and in the presence of time-varying factor loadings, OLS inference produces inconsistent estimates of conditional alphas and betas. We show that under a conditional CAPM with time-varying betas, predictable market risk premia, and stochastic systematic volatility, there is little evidence that the conditional alpha for a book-to-market trading strategy is statistically different from zero.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 11903.

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Date of creation: Dec 2005
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Handle: RePEc:nbr:nberwo:11903

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C51 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Construction and Estimation
G12 - Financial Economics - - General Financial Markets - - - Asset Pricing

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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Jiang, Danling, 2006. "Investor Overreaction, Cross-Sectional Dispersion of Firm Valuations, and Expected Stock Returns," Working Paper Series 2006-8, Ohio State University, Charles A. Dice Center for Research in Financial Economics. [Downloadable!]
  2. Hui Guo & Robert Savickas & Zijun Wang & Jian Yang, 2006. "Is value premium a proxy for time-varying investment opportunities: some time series evidence," Working Papers 2005-026, Federal Reserve Bank of St. Louis. [Downloadable!]
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