RT Journal Article SR Electronic T1 Asset Allocation in Stable and Unstable Times JF The Journal of Investing FD Institutional Investor Journals SP 72 OP 80 DO 10.3905/joi.2004.434554 VO 13 IS 3 A1 Rob Bauer A1 Roul Haerden A1 Roderick Molenaar YR 2004 UL https://pm-research.com/content/13/3/72.abstract AB Turbulence, uncertainty, and unstable parameters in financial markets can have severe effects on the risk and return characteristics of investment portfolios. A procedure for identification of multivariate outliers may be used to construct risk parameters and optimal portfolios for both quiet (good) and turbulent (bad) times. Is such a procedure profitable from a practitioner's point of view? According to a backtesting strategy under the assumption of perfect foresight with regard to the prevailing regime, a regime-switching strategy improves on a standard full-sample optimization strategy, but the transaction costs associated with high turnover detract considerably from performance.