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黄石2024-05-20 22:12:08
Hi. The key aspect of Sortino ratio is the use of semi-standard deviation. This measure accounts for the empirical evidence that investors are in fact loss-averse, not risk-averse: they prefer the volatility resulting from the upper side (i.e., gains), but dislike that resulting from the downside (i.e., losses). However, this property cannot be captured by the traditional standard deviation. In simple words, the Sortino ratio measures the excess return per downside risk, where the downside risk is measured by the semi-standard deviation. In the case of portfolio management, you can think of the Sortino ratio as a measure of the manager´s ability to gain in downside situations.
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