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A Dynamic Asset Pricing Model with Time-Varying Factor and Idiosyncratic Risk

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  • Paskalis Glabadanidis

Abstract

This paper uses a multivariate GARCH model to account for time variation in factor loadings and idiosyncratic risk in improving the performance of the CAPM and the three-factor Fama--French model. I show how to incorporate time variation in betas and the second moments of the residuals in a very general way. Both the static and conditional CAPM substantially outperform the three-factor model in pricing industry portfolios. Using a dynamic CAPM model results in a 30% reduction in the average absolute pricing error of size/book-to-market portfolios. Ad hoc analysis shows that the market beta of a value-minus-growth portfolio decreases whenever the default premium increases as well as during economic recessions. Copyright The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org., Oxford University Press.

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  • Paskalis Glabadanidis, 2009. "A Dynamic Asset Pricing Model with Time-Varying Factor and Idiosyncratic Risk," Journal of Financial Econometrics, Oxford University Press, vol. 7(3), pages 247-264, Summer.
    • Handle: RePEc:oup:jfinec:v:7:y:2009:i:3:p:247-264
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    File URL: http://hdl.handle.net/10.1093/jjfinec/nbp006
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    Cited by:

    1. Roumpis, Efthymios & Syriopoulos, Theodore, 2014. "Dynamics and risk factors in hedge funds returns: Implications for portfolio construction and performance evaluation," The Journal of Economic Asymmetries, Elsevier, vol. 11(C), pages 58-77.
    2. Salotti, Simone & Trecroci, Carmine, 2014. "Multifactor risk loadings and abnormal returns under uncertainty and learning," The Quarterly Review of Economics and Finance, Elsevier, vol. 54(3), pages 393-404.
    3. Carmine Trecroci, 2012. "Uncertainty and the Dynamics of Multifactor Loadings and Pricing Errors," Economics Bulletin, AccessEcon, vol. 32(3), pages 2453-2463.

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