Stats › Seizoenspatroon en kalender › January effect
The January effect faded in the broad market and lives on only in small caps
Mean January return in percent per month for the US market, by 25 year sub-period. The two highlighted periods fail the paper's t-test, its ANOVA and its Mann-Whitney test. The four sub-periods before 1891 are omitted here because three of the four have a negative January mean, which is a different story from decay.
January's mean return in the broad US market fell from 1.81% over 1941 to 1965 to 1.03% over 1991 to 2015, no longer significant on any of three tests. The small minus big January premium halved too, from 2.1% a month to 1.0%, but it is still there.
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