Standard deviation

Probability and Statistics

Standard deviation is a measure of the variation of a variable’s values about its arithmetic average. Low standard deviation means values tend to be close to the average, while high standard deviation means they are spread over a wider range. It is the square root of variance and is expressed in the same unit as the data. It is commonly denoted by the lowercase Greek letter sigma.

Definition: A measure of variation about an arithmetic average
Relation to variance: The square root of variance
Common notation: σ (sigma)

Sources and credits

Article: Standard deviation (English Wikipedia)
Wikidata: Q159375
Text: Card text is adapted from the English Wikipedia article by an automated summary. Wikipedia content is available under CC BY-SA 4.0; see the article history for its contributors. CC BY-SA 4.0 · Article history and contributors
Illustration: By M. W. Toews. CC BY 2.5 · File page on Wikimedia Commons
M. W. Toews, Own work, based (in concept) on figure by Jeremy Kemp, on 2005-02-09
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