Standard deviation

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Revision as of 15:27, 28 October 2014 by imported>Doug Williamson (Categorise the page and add link to qualification.)
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(SD).

Standard deviation measures the spread of data around their mean.

The standard deviation is the square root of the variance.

Standard deviation is used widely as a measure of risk, because it is relatively easy to calculate, compare and combine with the standard deviations of other variables.


See also