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Comparing USE3 and USE4: Portfolio Construction and Turnover

The enhancements introduced in the new Barra US Equity Model (USE4) are designed to improve risk forecasts for optimized portfolios. In this paper, we investigate the turnover and forecasting accuracy of optimized portfolios generated using USE4S, and compare them with those generated using the model's predecessor, USE3S. By testing various investment strategies, rebalancing on a daily or weekly basis, during the period 2007-2012, we found no systematic difference in turnover, and, in fact, the USE4S risk forecasts were found to be more accurate.