Standard Deviation

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Standard Deviation

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A measure of the dispersion of data points around their mean value. It is the positive square root of the arithmetic mean of the squares of the deviation from the arithmetic mean of the population:

Missing Image:img src="SP7_s_files/stddev.gif"

where m is arithmetic mean; d is deviation from the arithmetic mean; and n is number of points. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use