Sharpe ratio
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This is the current revision of Sharpe ratio as edited by KevinDavis (Talk | contribs) at 23:00, 23 October 2011. This URL is a permanent link to this version of this page.
The Sharpe ratio or reward-to-variability ratio is a financial ratio that measures the compensation (called a "risk premium") an investor receives for bearing an additional unit of risk. It is defined as
where 
is the asset's expected return, 
is the risk-free rate (normally, the rate of return of a United States T-bill) and 
is the risk associated with the investment.
Development
The concept of a Sharpe ratio was first developed by William Sharpe, a professor of finance at Stanford University.
