BacktestFolio · Glossary
Sharpe
In plain language
Answers: 'For every unit of risk taken, how much extra performance did I earn compared with taking no risk?' Higher is better compensation for risk on the sample you measured; a fixed cutoff such as 'above 1' means little without asset-class and period context.
Technical definition
Ratio of mean annual excess return over the risk-free rate to annual volatility, both calculated on monthly returns over the period.