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The impact of portfolio aggregation on day-of-the-week effect: Evidence from Finland

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  • Högholm, Kenneth
  • Knif, Johan

Abstract

This paper revisits the day-of-the-week anomaly discussion from a portfolio aggregation point of view. Using different levels of portfolio aggregation: market, industry and company levels, it is possible to partly trace the aggregation level of the effect of the factors driving the day-of-the-week anomaly. The effect of portfolio aggregation is measured using a conditional modeling approach. Overall, the results indicate more pronounced day-of-the-week structures in the conditional volatility than in the mean returns and considerably more day-of-the-week structures during the post-euro period. For this period the results indicate that the day-of-the-week effect in the mean is partly a common Finnish market characteristic whereas the day-of-the-week effect in the volatility is found on the industry level of portfolio aggregation.

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  • Högholm, Kenneth & Knif, Johan, 2009. "The impact of portfolio aggregation on day-of-the-week effect: Evidence from Finland," Global Finance Journal, Elsevier, vol. 20(1), pages 67-79.
    • Handle: RePEc:eee:glofin:v:20:y:2009:i:1:p:67-79
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