Sell in May and Go Away: Still Good Advice for Investors?
Alpha Portfolio Advisors
University of Hamburg
April 20, 2014
The “Sell in May and Go Away” (or Halloween) strategy continues to enjoy great popularity in practice. We explore whether this simple trading rule still offers an opportunity to earn abnormal returns. In contrast to prior studies, we consider sample periods during which adequate investment instruments were available for an effective implementation of the Halloween strategy. In addition, we account for when the first study confirming the Halloween effect was published in a top academic journal. To use the limited data in the most efficient way, and to avoid possible data-snooping biases, we implement a bootstrap simulation approach. We find that the Halloween effect strongly weakened or even diminished in recent years. Our results are robust across different countries and against various parameter variations. Overall, our findings support the theory of efficient capital markets.
Number of Pages in PDF File: 38
Keywords: Sell in May, Halloween effect, bootstrap simulation, statistical inference, investment strategy
JEL Classification: G11, G12, G14
Date posted: May 21, 2014
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