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发表于 2012-4-3 09:54
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Janice Barefoot, CFA, has managed a portfolio where she used the Dow Jones Industrial Average (DJIA) as a benchmark. In the past two years the average monthly return on her portfolio has been higher than that of the DJIA. To get a measure of active return per unit of active risk Barefoot should compute the: A)
| information ratio, which is the standard deviation of the differences between the portfolio and benchmark returns divided by the average of those differences. |
| B)
| Sharpe ratio, which is the standard deviation of the differences between the portfolio and benchmark returns divided into the average of those differences. |
| C)
| information ratio, which is the standard deviation of the differences between the portfolio and benchmark returns divided into the average of those differences. |
|
The information ratio is the measure of active return per unit of active risk. If we let X = (monthly portfolio return − the benchmark return), then the information ratio = (the average of X / the standard deviation of X). It is similar to the Sharpe ratio, which defines the random variable Y as Y = (monthly portfolio return − the risk-free rate). The Sharpe ratio = (the average of Y / the standard deviation of the portfolio return) = the standard deviation of Y if the risk-free rate is constant. |
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