Noun
standard deviation (plural standard deviations)
(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).
If values are fairly evenly distributed around an average, then roughly two-thirds of all outcomes will be one standard deviation other side of the average. Steve Keen
About 68% of values drawn from a normal distribution are within one standard deviation σ away from the mean; about 95% of the values lie within two standard deviations; and about 99.7% are within three standard deviations. Source: Internet
Again, all groups means were within one standard deviation of the controls, meaning that while effects were statistically reliable, the children were as a whole, still within the normal range. Source: Internet
As you can see, standard deviation is many times the magnitude of the expected loss. citation The standard deviation for pai gow poker is the lowest out of all common casinos. citation Many, particularly slots, have extremely high standard deviations. Source: Internet
Chebyshev's inequality ensures that, for all distributions for which the standard deviation is defined, the amount of data within a number of standard deviations of the mean is at least as much as given in the following table. Source: Internet
A one standard deviation increase in partisan disagreement during the pandemic led to 7% more abnormal stock turnover. Source: Internet