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Sharpe Ratio
Risk Management
どういう意味か
A number that measures return earned per unit of risk taken. Above 1 is good, above 2 is excellent, and below 0 means you are losing money.
例
A strategy returning 20% a year with 10% annual volatility has a Sharpe of about 2.0 (after adjusting for the risk-free rate). Another returning 20% with 30% volatility has a Sharpe of about 0.67 -- worse risk-adjusted.
初心者がよくやるミス
Beginners compare strategies by raw return only. A 30% return with a 0.4 Sharpe is far worse than a 20% return with a 1.8 Sharpe -- the first is taking dangerous risk for the same dollars.
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