Optimal Dynamic Portfolio Risk Management
研究了同时控制跨资产和跨时间风险的动态投资组合策略，通过多期模型和实证模拟证明其优于单一风险控制方法。
Numerous econometric studies report that financial asset volatilities and correlations are time varying and predictable. Over the past decade, this knowledge has stimulated increasing interest in various dynamic portfolio risk control techniques. At present, the two basic types of risk control techniques—<i>risk control across assets</i> and <i>risk control over time</i>—are not implemented simultaneously, and there has been surprisingly little theoretical study of optimal dynamic portfolio risk management. This article fills this gap in the literature by formulating and solving the multiperiod portfolio choice problem. Using several datasets and performing out-of-sample simulations, the author demonstrates that it is optimal to simultaneously control portfolio risk across assets and over time. Specifically, the author shows that portfolios with risk control only across assets outperform equally weighted portfolios and that portfolios with risk control both across assets and over time outperform portfolios with risk control across assets only. <b>TOPICS:</b>VAR and use of alternative risk measures of trading risk, portfolio construction, performance measurement