What are 'Risk Measures'
Risk measures are statistical measures that are historical predictors of investment risk and volatility, and they are also major components in modern portfolio theory (MPT). MPT is a standard financial and academic methodology for assessing the performance of a stock or a stock fund as compared to its benchmark index.
BREAKING DOWN 'Risk Measures'
There are five principal risk measures, and each measure provides a unique way to assess the risk present in investments that are under consideration. The five measures include the alpha, beta, Rsquared, standard deviation and Sharpe ratio. Risk measures can be used individually or together to perform a risk assessment. When comparing two potential investments, it is wise to compare like for like in order to determine which investment holds the most risk.Alpha
Alpha measures risk relative to the market or a selected benchmark index. For example, if the S&P 500 has been deemed the benchmark for a particular fund, the activity of the fund would be compared to that experienced by the selected index. If the fund outperforms the benchmark, it is said to have a positive alpha. If the fund falls below the performance of the benchmark, it is considered to have a negative alpha.
Beta
Beta measures the volatility or systemic risk of a fund in comparison to the market or the selected benchmark index. A beta of one indicates the fund is expected to move in conjunction with the benchmark. Betas below one are considered less volatile than the benchmark, while those over one are considered more volatile than the benchmark.
RSquared
RSquared measures the percentage of an investment's movement that is attributable to movements in its benchmark index. An Rsquared value represents the correlation between the examined investment and its associated benchmark. For example, an Rsquared value of 95 would be considered to have a high correlation, while an Rsquared value of 50 may be considered low. The U.S. Treasury Bill functions as a benchmark for fixedincome securities, while the S&P 500 Index functions as a benchmark for equities.
Standard Deviation
Standard deviation is a method of measuring data dispersion in regards to the mean value of the dataset and provides a measurement regarding an investmentâ€™s volatility. As it relates to investments, the standard deviation measures how much return on an investment is deviating from the expected normal or average returns.
Sharpe Ratio
The Sharpe ratio measures performance as adjusted by the associated risks. This is done by removing the rate of return on a riskfree investment, such as a U.S. Treasury Bond, from the experienced rate of return. This is then divided by the associated investmentâ€™s standard deviation and serves as an indicator of whether an investment's return is due to wise investing or due to the assumption of excess risk.

Dispersion
A statistical term describing the size of the range of values ... 
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Active Risk
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Volatility
1. A statistical measure of the dispersion of returns for a given ...

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