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・ Geometric phase analysis
・ Geometric Poisson distribution
・ Geometric primitive
・ Geometric probability
・ Geometric programming
・ Geometric progression
・ Geometric quantization
・ Geometric quotient
・ Geometric separator
・ Geometric series
・ Geometric shape
・ Geometric Shapes
・ Geometric Shapes Extended
・ Geometric spanner
・ Geometric stable distribution
Geometric standard deviation
・ Geometric Technologies, Inc.
・ Geometric terms of location
・ Geometric tomography
・ Geometric topology
・ Geometric topology (disambiguation)
・ Geometric topology (object)
・ Geometric tortoise
・ Geometric transformation
・ Geometrical acoustics
・ Geometrical frustration
・ Geometrical optics
・ Geometrical-optical illusions
・ Geometrically and materially nonlinear analysis with imperfections included
・ Geometrically regular ring


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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)

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