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Capital asset pricing model in Portugal: Evidence from fractal regressions

Author

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  • Ladislav Kristoufek

    (Czech Academy of Sciences)

  • Paulo Ferreira

    (VALORIZA - Research Center for Endogenous Resource Valorization
    Universidade de Évora, Largo dos Colegiais 2
    Instituto Politécnico de Portalegre)

Abstract

We examine risk profiles of the Portuguese stock market index component stocks using a novel approach to the classical capital asset pricing model (CAPM). Specifically, we estimate the CAPM via fractal regressions that allow studying the marginal effects at selected scales. In this way, we can reveal whether the risk is perceived differently by market participants with different investment horizons. Apart from the analysis itself, we provide new statistical insights into the issue of separating and comparing the scale-specific effects with statistical validity. We find several stocks deviating from an expected risk perception homogeneity across investment horizons. This is true for both analysed periods, i.e. before and after the global financial crisis. There are also several stocks that changed their relationship to the market portfolio in between, which has strong implications for possible portfolio construction. The proposed methodology is not limited to financial topics but can be used in any discipline where the scale-specific marginal effects might be of interest.

Suggested Citation

  • Ladislav Kristoufek & Paulo Ferreira, 2018. "Capital asset pricing model in Portugal: Evidence from fractal regressions," Portuguese Economic Journal, Springer;Instituto Superior de Economia e Gestao, vol. 17(3), pages 173-183, November.
    • Handle: RePEc:spr:portec:v:17:y:2018:i:3:d:10.1007_s10258-018-0145-5
    DOI: 10.1007/s10258-018-0145-5
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