Standard Deviation 2
Standard Deviation 2 : (a) A measure of dispersion or variation. It is the most widely used measure of dispersion of a frequency distribution. It is equal to the positive square root of the VARIANCE. The mean tells where the values for a group are centered. The standard deviation is a summary of how widely dispersed the values are around this center. [Last, 1983: A Dictionary of Epidemiology]; (b) A measure of dispersion or variation, usually taken as the square root of the variance. [SRA, 1999: Glossary of Risk Analysis Terms] [USDOE, 2000: RAIS Glossary]
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