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Improving the Market Model: The 4-State Model Alternative

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Author Info

  • Octave JOKUNG

    (Edhec Business School)

  • Jean-Christophe MEYFREDI

    (Edhec Business School)

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    Abstract

    The present paper conducts an empirical study by examining the Market Model and the three versions of the 4-State Model (translated, rotated and un-rotated) in a mean-beta framework. Using daily returns from the CAC 40 Index's assets, we find that the explanatory power of the 4-State Model is greater than the one of the Market Model and this effect is improved by rotation. A reduction in the non-systematic risk is also observed when switching from Market Model to 4-State Models. Surprisingly, the betas are more stable when using any version of the 4- State Model. This could have a strong impact on portfolio diversification and call widely held opinion into question.

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    File URL: http://128.118.178.162/eps/fin/papers/0403/0403006.pdf
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    Bibliographic Info

    Paper provided by EconWPA in its series Finance with number 0403006.

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    Length: 24 pages
    Date of creation: 30 Mar 2004
    Date of revision:
    Handle: RePEc:wpa:wuwpfi:0403006

    Note: Type of Document - pdf; pages: 24
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    Web page: http://128.118.178.162

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    Keywords: Market Model; Arch;

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    References

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    1. Chen, Nai-Fu & Roll, Richard & Ross, Stephen A, 1986. "Economic Forces and the Stock Market," The Journal of Business, University of Chicago Press, vol. 59(3), pages 383-403, July.
    2. Shanken, Jay, 1982. " The Arbitrage Pricing Theory: Is It Testable?," Journal of Finance, American Finance Association, vol. 37(5), pages 1129-40, December.
    3. Campbell R. Harvey & Akhtar Siddique, 2000. "Conditional Skewness in Asset Pricing Tests," Journal of Finance, American Finance Association, vol. 55(3), pages 1263-1295, 06.
    4. Roll, Richard, 1977. "A critique of the asset pricing theory's tests Part I: On past and potential testability of the theory," Journal of Financial Economics, Elsevier, vol. 4(2), pages 129-176, March.
    5. Fama, Eugene F & MacBeth, James D, 1973. "Risk, Return, and Equilibrium: Empirical Tests," Journal of Political Economy, University of Chicago Press, vol. 81(3), pages 607-36, May-June.
    6. Fabozzi, Frank J & Francis, Jack Clark, 1977. "Stability Tests for Alphas and Betas over Bull and Bear Market Conditions," Journal of Finance, American Finance Association, vol. 32(4), pages 1093-99, September.
    7. Bhardwaj, Ravinder K & Brooks, LeRoy D, 1993. "Dual Betas from Bull and Bear Markets: Reversal of the Size Effect," Journal of Financial Research, Southern Finance Association;Southwestern Finance Association, vol. 16(4), pages 269-83, Winter.
    8. Black, Fischer, 1972. "Capital Market Equilibrium with Restricted Borrowing," The Journal of Business, University of Chicago Press, vol. 45(3), pages 444-55, July.
    9. White, Halbert, 1980. "A Heteroskedasticity-Consistent Covariance Matrix Estimator and a Direct Test for Heteroskedasticity," Econometrica, Econometric Society, vol. 48(4), pages 817-38, May.
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