standard deviation

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EnglishEdit

EtymologyEdit

Coined by English mathematician Karl Pearson in 1894 in his paper "On the dissection of asymmetrical frequency curves".

NounEdit

standard deviation ‎(plural standard deviations)

  1. (statistics) A measure of how spread out data values are around the mean, defined as the square root of the variance. Represented with the Greek letter σ ‎(sigma).

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