More usefully , the data also suggest that banks could use an improving Sharpe ratio over time as a measure that indicates a trader has developed a skill worth paying for.

更有用的一点是，我们的数据也表明，银行可以根据夏普比率随着时间推移而提高的程度，来判断一名交易员是否掌握了与薪酬相称的技能。

That led to the widespread use of the Sharpe ratio as a measurement tool.

因此,许多人开始使用夏普指数作为衡量工具.