To begin the analysis, we compute the 11-month and 12-month holding-period excess returns following positive and negative Januarys for the decile containing the smallest capitalization stocks and ask whether the spread between excess returns following positive and negative Januarys is significant. We define positive and negative Januarys using VW excess market returns. We then repeat the comparison using the three deciles of stocks having the smallest market capitalizations, using the decile of stocks with the largest market capitalizations, and using the three deciles of stocks with the largest markets capitalizations.
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