standard deviation


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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 ?
The study found that standard deviations in temperature in both summer and winter adversely affected death rates.
The greater the variation the larger the standard deviation.
The standard deviation of the pretest academic responsibility data was SD = .
It is the ratio of the standard deviation relative to the mean.
Investigations have also shown that the standard deviation of the maximum torque values inside a batch and from batch-to-batch can be reduced about 50%.
The magnetometer has an intrinsic sensitivity of 29 fT, defined as the Allan standard deviation for a bandwidth of 1 Hz.
From the beginning of kindergarten to the end of first grade, black students lose 20 percent of a standard deviation (approximately 10 percent of a standard deviation each year) relative to white students with similar characteristics.
In this new method, instead of fitting a response-error relationship, we make (and test) the assumption that response variance is uniform over the response range of the assay; if so, we can use a single pooled estimate of the standard deviation in response units.
Step 2: Compute mean and standard deviation of demand coverage:
Among 81 patients whose transplants had been performed at least 12 months previously, "the only method that predicted the medical outcome variables (biopsy-proven rejection and number of biopsies) was the standard deviation of medication blood levels," wrote Eyal Shemesh, MD and colleagues.
Second, the alternative standard error estimator, although better than the default estimate provided by S-Plus, still did not provide a satisfactory estimate of the standard deviation of [beta] Third, most of the variance observed in [beta] in the first simulation study was due to bias.
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