Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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back to [[Summary Statistics]] A measure of statistical displersion must yield a number which is zero if all the data are identical and must increase as the data are more diverse. A very important measure of dispersion is the [Standard Deviation]], the square root of the [[Variance]]. Other such measures include the [[Statistical Range]], the [[Interquartile Range]], and the [[Absolute Deviation]]. None of these can be negative, their least possible value is zero. ---- [[Dick Beldin]]