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Measuring performance

Sortino ratio

Like the Sharpe ratio, but dividing only by downside volatility rather than all volatility.

How it works

It corrects the Sharpe ratio’s main oddity: being charged for large gains. Only returns below a threshold count towards the risk measure.

For strategies with asymmetric return profiles, Sortino is the fairer comparison.

Formula

Sortino = (portfolio return − target return) ÷ downside deviation

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