Time Variation in Mutual Fund Style Exposures

Jan Annaert and Geert Van Campenhout

Review of Finance, 2007, vol. 11, issue 4, 633-661

Abstract: Despite the wide acceptance of return-based style analysis, the method has several limitations. One important drawback is the assumption that style exposures are time-invariant. We apply results on break tests developed in Bai and Perron (1998, 2003) to test for style breaks. We find strong evidence against the hypothesis of constant time exposures in daily return data for European equity funds. All funds exhibit at least one break, and 60% exhibit more than one break. We show that the main reason for style breaks is the mutual funds' reliance on conditional investment strategies based on public information and volatility estimates. Copyright 2007, Oxford University Press.

Date: 2007
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