Robust Factor-Based Investing

In quantitative portfolio management, combining optimization with estimation causes concern for asset managers because portfolio problems may be sensitive to deviations in their inputs, but obtaining accurate input estimates is a difficult task. Robust factor models address these concerns using factor models for estimating asset returns and worst-case approaches for gaining stability in portfolio performance. Recent studies on robust factor investing explore methods of incorporating factors into robust portfolio construction. In this article, the authors provide a survey that includes theoretical insight, empirical findings from historical data, and experience from practitioners in formulating and executing robust factor-based investment strategies.