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geometric standard deviation : ウィキペディア英語版
geometric standard deviation
In probability theory and statistics, the geometric standard deviation describes how spread out are a set of numbers whose preferred average is the geometric mean. For such data, it may be preferred to the more usual standard deviation. Note that unlike the usual ''arithmetic'' standard deviation, the ''geometric'' standard deviation is a multiplicative factor, and thus is dimensionless, rather than having the same dimension as the input values.
==Definition==
If the geometric mean of a set of numbers is denoted as μ''g'', then the geometric standard deviation is
: \sigma_g = \exp \left( \sqrt )^2 \over n } \right). \qquad \qquad (1)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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