Statistical_Dispersion

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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. 
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[[Dick Beldin]]