Deflated Sharpe ratio

DSR penalizes upside volatility as much as downside

The Deflated Sharpe ratio (DSR) is designed to correct for biases and overfitting in financial performance testing. It provides a more accurate assessment by considering the variance of Sharpe estimates, the number of trials, and their effective independence.

Example

A hedge fund using DSR may find that an investment strategy with high upside volatility is not statistically significant, even if it appears profitable in a traditional Sharpe ratio analysis.

Remember this

Understanding the DSR's limitation helps investors avoid misinterpreting high volatility as a sign of superior performance, leading to better investment decisions.

Text adapted from Wikipedia, licensed under CC BY-SA 4.0.

Related concepts

Bias ratio

Bias ratio detects valuation bias in asset pricing

Beta (finance)

Beta measures a stock's volatility relative to the market

Sharpe ratio

Sharpe ratio measures excess return per unit of risk: (R - Rf) / σ

Graham number

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Volatility smile

Implied volatility varies with strike price, contradicting Black-Scholes

Treynor ratio

Treynor ratio measures excess return per unit of systematic risk

Educational content, not financial advice.

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