Testing Mutual Fund Market-Timing Ability with Daily Returns

Summary

This article summarizes research on whether mutual fund managers adjust market exposure ahead of rises and declines. It describes Treynor–Mazuy and Henriksson–Merton regression tests, augmented with market, size, value, and momentum factors, and compares estimates from daily and monthly returns. To address false positives from option-like fund returns or style differences, the study constructs style-matched synthetic funds without timing ability. It also uses bootstrap resampling of residuals to estimate uncertainty in timing coefficients.

For a sample of 230 funds over 1985–1995, the article reports that daily-frequency tests identify more significant timing coefficients than monthly tests. With the Treynor–Mazuy model, it reports significant positive and negative coefficients for 40.8% and 28.1% of funds using daily returns, compared with 33.5% and 5.3% using monthly returns. A style-control comparison likewise reports 34.2% versus 11.9% showing significant timing ability. These are historical sample findings; the article’s strong inference that managers possess timing skill depends on the models, sample, and controls used.

Key ideas

• The Treynor–Mazuy and Henriksson–Merton models estimate timing ability through nonlinear relationships between fund and market returns.
• Adding market, size, value, and momentum factors helps account for benchmark exposures.
• The study compares timing estimates from daily and monthly return data and finds more significant coefficients at daily frequency.
• Style-matched synthetic funds and bootstrap resampling are used to examine false positives and coefficient uncertainty.
• The reported evidence comes from a historical sample and does not establish that the results generalize to other periods or funds.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.