Sharpe Ratio

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A Sharpe Ratio is a ratio of the excess return (or risk premium) per unit of deviation in a trading strategy (such as by investment asset).



References

2015


2014

  • http://www.investopedia.com/terms/s/sharperatio.asp
    • QUOTE: A ratio developed by Nobel laureate William F. Sharpe to measure risk-adjusted performance. The Sharpe ratio is calculated by subtracting the risk-free rate - such as that of the 10-year U.S. Treasury bond - from the rate of return for a portfolio and dividing the result by the standard deviation of the portfolio returns. The ex-ante Sharpe ratio formula is:

      ...

      The ex-post Sharpe ratio uses the same formula but with realized portfolio return instead of expected return. ...

      ... The Sharpe ratio tells us whether a portfolio's returns are due to smart investment decisions or a result of excess risk. Although one portfolio or fund can reap higher returns than its peers, it is only a good investment if those higher returns do not come with too much additional risk. The greater a portfolio's Sharpe ratio, the better its risk-adjusted performance has been. A negative Sharpe ratio indicates that a risk-less asset would perform better than the security being analyzed.