RT Journal Article SR Electronic T1 Exploring the Dimensions of Active Management JF The Journal of Portfolio Management FD Institutional Investor Journals SP 31 OP 36 DO 10.3905/jpm.2006.661368 VO 33 IS 1 A2 Dorsey D. Farr YR 2006 UL https://pm-research.com/content/33/1/31.abstract AB The level of active return, the volatility of active return, and the covariance structure of active return are three important dimensions of active management for understanding optimal portfolio structure. An optimal portfolio structure is highly sensitive to various assumptions about the covariance structure of active return; it varies with both the degree of diversification in active returns and the number of unique sources of active return. If the sources of active return are not diversified, investors should make a substantial allocation to risk-controlled active strategies. As there are more separate sources of active return or greater diversification among those sources, the optimal allocation to index strategies and risk-controlled active strategies may be lower.TOPICS: Portfolio construction, equity portfolio management, risk management