Sharpe ratio: Difference between revisions
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The thing is, [[Sharpe ratio]]s work really well until they don’t. | The thing is, [[Sharpe ratio]]s work really well until they don’t. | ||
===Famous [[Sharpe ratio]]s=== | |||
[[LTCM]]’s [[Sharpe ratio]] was 4.35, right up until it imploded, nearly bringing down the global financial system with it. | *[[LTCM]]’s [[Sharpe ratio]] was 4.35, right up until it imploded, nearly bringing down the global financial system with it. | ||
[[Madoff]]’s was about 4. | *[[Madoff]]’s was about 4. | ||
{{sa}} | {{sa}} | ||
Revision as of 12:57, 15 October 2020
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The Sharpe ratio, named after William F. Sharpe, who developed it in 1966, measures the performance of a portfolio against a risk-free asset. It is defined as the difference between the returns of the investment and the risk-free return, divided by the standard deviation of the investment (being, a somewhat optimistically limited measurement of its volatility). The higher your Sharpe ratio, the more awesome a hedge fund manager you are. A Sharpe ratio of 4 or more puts you in “I’m so good it hurts and, if I ever knew what hubris was, I just don’t care about it now” territory.
The thing is, Sharpe ratios work really well until they don’t.
Famous Sharpe ratios
- LTCM’s Sharpe ratio was 4.35, right up until it imploded, nearly bringing down the global financial system with it.
- Madoff’s was about 4.