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- W3123908711 abstract "Abstract This paper proposes modified versions of the Sharpe ratio and Jensen's alpha, which are appropriate in a simple continuous-time model. Both are derived from optimal portfolio selection. The modified Sharpe ratio equals the ordinary Sharpe ratio plus half of the volatility of the fund. The modified alpha also differs from the ordinary alpha by a second-moment adjustment. The modified and the ordinary Sharpe ratios may rank funds differently. In particular, if two funds have the same ordinary Sharpe ratio, then the one with the higher volatility will rank higher according to the modified Sharpe ratio. This is justified by the underlying dynamic portfolio theory. Unlike their discrete-time versions, the continuous-time performance measures take into account that it is optimal for investors to change the fractions of their wealth held in the fund vs. the riskless asset over time." @default.
- W3123908711 created "2021-02-01" @default.
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- W3123908711 date "2004-03-01" @default.
- W3123908711 modified "2023-09-30" @default.
- W3123908711 title "Sharpe Ratios and Alphas in Continuous Time" @default.
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- W3123908711 doi "https://doi.org/10.1017/s0022109000003902" @default.
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