Abstract
A quantitative measure of style drift measures the variability of a portfolio's effective asset mix as determined by return-based style analysis around the portfolio's average effective asset mix. A style drift score eliminates examination of countless rolling-window asset allocation graphs and rolling-window style maps; it quantifies the style drift of a portfolio in a single statistic. A style drift score is ideal for screening thousands of portfolios, comparing the style consistency of portfolios, and monitoring drift in a portfolio's style.
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