Decomposing Fixed-Income Fund Returns to Assess Factor-Timing Skill

Summary

The document describes a framework for separating active fixed-income fund returns into persistent strategic factor exposure, short-term tactical exposure, and residual return, which it treats mainly as security selection. Long-run factor betas are estimated with expanding-window regressions, while quarterly estimates based on daily returns capture short-term changes in exposure. The difference between the short- and long-term betas represents factor timing. The analysis covers US fixed-income funds from 1999 to 2018 and considers credit, securitized assets, and duration.

The reported findings are that most funds held persistent positive credit exposure, while average tactical timing detracted from returns. Tactical timing and security-selection results showed persistence and helped predict future active returns; strategic contributions tended to mean-revert. The strongest caveats are that results rely on historical data and model choices, the residual is not a pure measure of security selection, and gross returns can overstate investor outcomes after fees. The document also notes that identifying funds focused on timing is imperfect without holdings data.

Key ideas

• Separate active fixed-income returns into strategic factor exposure, tactical factor timing, and residual return.
• Use long-term and quarterly factor regressions to distinguish persistent exposure from short-term changes.
• The study reports widespread persistent credit exposure and negative average timing contributions.
• Tactical timing and security selection showed persistence, while strategic factor contributions tended to mean-revert.
• Interpret residual returns cautiously because they may include effects beyond security selection and fees reduce investor returns.

Tags

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