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Seasonality in outliers of daily stock returns: A tail that wags the dog?

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  • Galai, Dan
  • Kedar-Levy, Haim
  • Schreiber, Ben Z.

Abstract

We document significant intra-year seasonality in outliers of S&P500 daily rates of return. Controlling for outliers in dummy regressions reveals that both the January and Monday effects turn from insignificant to highly significant. Mean daily return on January doubles and becomes significantly higher than all other months of the year, and Monday's mean return turns significantly positive and higher than other days of the week. The recently documented Halloween effect turns significant only after controlling for outliers as June, August, and September turn out to be months with remarkably low rates of returns. Being random, outliers cannot serve as instrumental variables for designing trading rules, yet, their impact on options pricing through the increase in volatility, may be applied for profitable options strategies.

Suggested Citation

  • Galai, Dan & Kedar-Levy, Haim & Schreiber, Ben Z., 2008. "Seasonality in outliers of daily stock returns: A tail that wags the dog?," International Review of Financial Analysis, Elsevier, vol. 17(5), pages 784-792, December.
    • Handle: RePEc:eee:finana:v:17:y:2008:i:5:p:784-792
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    3. Krishna Reddy & Rudi Bosman & Nawazish Mirza, 2019. "Impact Of Credit Ratings On Stock Returns," Bulletin of Monetary Economics and Banking, Bank Indonesia, vol. 21(3), pages 343-366, January.
    4. Haggard, K. Stephen & Witte, H. Douglas, 2010. "The Halloween effect: Trick or treat?," International Review of Financial Analysis, Elsevier, vol. 19(5), pages 379-387, December.
    5. Gonzalez-Perez, Maria T. & Guerrero, David E., 2013. "Day-of-the-week effect on the VIX. A parsimonious representation," The North American Journal of Economics and Finance, Elsevier, vol. 25(C), pages 243-260.
    6. Doyle, John R. & Chen, Catherine Huirong, 2009. "The wandering weekday effect in major stock markets," Journal of Banking & Finance, Elsevier, vol. 33(8), pages 1388-1399, August.
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    8. Keef, Stephen P. & Khaled, Mohammed & Zhu, Hui, 2009. "The dynamics of the Monday effect in international stock indices," International Review of Financial Analysis, Elsevier, vol. 18(3), pages 125-133, June.
    9. Dragos Stefan Oprea, 2014. "The Halloween Effect Evidence from Romania," International Journal of Academic Research in Business and Social Sciences, Human Resource Management Academic Research Society, International Journal of Academic Research in Business and Social Sciences, vol. 4(7), pages 463-471, July.
    10. Laurens Swinkels & Pim van Vliet, 2012. "An anatomy of calendar effects," Journal of Asset Management, Palgrave Macmillan, vol. 13(4), pages 271-286, August.
    11. Júlio Lobão, 2018. "Are African Stock Markets Inefficient? New Evidence on Seasonal Anomalies," Scientific Annals of Economics and Business (continues Analele Stiintifice), Alexandru Ioan Cuza University, Faculty of Economics and Business Administration, vol. 65(3), pages 283-301, September.
    12. Degenhardt, Thomas & Auer, Benjamin R., 2018. "The “Sell in May” effect: A review and new empirical evidence," The North American Journal of Economics and Finance, Elsevier, vol. 43(C), pages 169-205.
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