Statistik › Saisonalität und Kalender › Sell in May
Sell in May survived in the global pooled data and not in any single investable index
Halloween dummy coefficient in percent per month, full index history against the decade strictly after the original paper was published. Index histories begin between 1965 and 1988 and all end December 2012. Every full-sample coefficient is significant. None of the post-publication coefficients is.
The original paper found November to April returns higher in thirty six of thirty seven countries. Tested on the decade after it was published, the coefficient is statistically insignificant in all six investable indices one study examined, including the S&P 500 at a t statistic of 0.95.
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