Monthly Measurement of Daily Timers

William Goetzmann, Jonathan Ingersoll and Zoran Ivković

Journal of Financial and Quantitative Analysis, 2000, vol. 35, issue 3, 257-290

Abstract: This paper addresses the bias associated with parametric measurement of timing skill based on monthly timer returns when timers can make daily timing decisions. Simulations suggest that the classic Henriksson-Merton parametric measure of timing skill is weak and biased downward when applied to the monthly returns of a daily timer. The paper proposes an adjustment that mitigates this problem without the need to collect daily timer returns. Four tests of timing skill, carried out on a sample of 558 mutual funds, show that very few funds exhibit statistically significant timing skill. More encompassing, the adjusted-FF3 test (based on the specification that incorporates both the proposed adjustment and the Fama-French three-factor model) is the least biased measure of timing skill among the four—it provides for a sharper inference regarding timing skill and helps mitigate biases associated with the choice of investment style.

Date: 2000
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