standard deviation


Also found in: Thesaurus, Medical, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
Related to standard deviation: variance

standard deviation

n. Abbr. SD
A statistic used as a measure of the dispersion or variation in a distribution or set of data, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.

standard deviation

n
(Statistics) statistics a measure of dispersion obtained by extracting the square root of the mean of the squared deviations of the observed values from their mean in a frequency distribution

stand′ard devia′tion



n. Statistics.
a measure of dispersion in a frequency distribution, equal to the square root of the mean of the squares of the deviations from the arithmetic mean of the distribution.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.standard deviation - the square root of the variance
statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
variance - the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value
Translations
směrodatná odchylka
keskihajonta
écart type
staðalfrávik
ส่วนเบี่ยงเบนมาตรฐาน
References in periodicals archive ?
Mean ages of Parkinson's diagnosis were much later - 58 years for patients whose primary prodrome was depression, with a standard deviation of 9.
This means that if the datapoints are all over the place or skewed to the outside, using standard deviation will be less sensitive.
Impact on course grades of a one standard deviation increase in Math I instructor quality Course grades in Math I Course grades in Math II Overall 0.
Standard deviation is a useful measure of ballistic uniformity.
The profit from the application of the Interpolated DFT is defined as the ratio of the frequency bin to the standard deviation of measurements when the Interpolated DFT is used.
A z-score is like a standard deviation score but it resets the measure so that the mean is 0, which allows for some easier calculations of later statistics.
The study found that standard deviations in temperature in both summer and winter adversely affected death rates.
The calculation of the standard deviation is only meaningful if the data are normally distributed, ie, if they produce a symmetrical bell-shaped curve when plotted.
The Florida statute at issue defined "significantly subaverage general intellectual functioning" as "performance that is two or more standard deviations from the mean score on a standardized intelligence test"--i.
The greater the variation the larger the standard deviation.
Translation: Money market funds have the smallest standard deviation (ergo, the least risk), yet one would never invest long-term retirement assets in such a low return investment vehicle.
Export value growth at historical average minus one standard deviation in 2014-15 3/###20###24###31###30###29###28###23###14

Full browser ?