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In search of momentum profits: are they illusory?

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We test whether a Genetic Algorithm (GA) can find profitable investment strategies based on prior stock returns and earnings surprises. We add to the argument whether momentum investing profits are a statistical illusion. The performance of the optimized momentum portfolios is evaluated before and after trading costs, during different time periods, over two market states, and after adjusting for risk. The GA optimization improves the annual returns of the momentum strategies by 2% to 6%. After considering transaction costs, both price and earnings momentum portfolios do not appear to generate abnormal returns. Positive risk-adjusted returns net of trading costs are documented solely in the ‘up’ markets for a portfolio long in prior winners only.
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Keywords: C61; G14; G19; genetic algorithm; investment strategies

Document Type: Research Article

Affiliations: 1: School of Business,University of Houston-Clear Lake, Houston, USA 2: Department of Finance and Real Estate,Florida International University, Miami, USA

Publication date: 2011-11-01

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