deviation from the mean

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• mean deviation from the mean — noun the arithmetic mean of the absolute values of deviations from the mean of a distribution • Syn: ↑mean deviation • Topics: ↑statistics • Hypernyms: ↑deviation …   Useful english dictionary

• Regression toward the mean — In statistics, regression toward the mean (also known as regression to the mean) is the phenomenon that if a variable is extreme on its first measurement, it will tend to be closer to the average on a second measurement, and a fact that may… …   Wikipedia

• Mean — This article is about the statistical concept. For other uses, see Mean (disambiguation). In statistics, mean has two related meanings: the arithmetic mean (and is distinguished from the geometric mean or harmonic mean). the expected value of a… …   Wikipedia

• mean deviation — noun the arithmetic mean of the absolute values of deviations from the mean of a distribution • Syn: ↑mean deviation from the mean • Topics: ↑statistics • Hypernyms: ↑deviation * * * noun …   Useful english dictionary

• Error of the mean square — Mean Mean, a. [OE. mene, OF. meiien, F. moyen, fr. L. medianus that is in the middle, fr. medius; akin to E. mid. See {Mid}.] 1. Occupying a middle position; middle; being about midway between extremes. [1913 Webster] Being of middle age and a… …   The Collaborative International Dictionary of English

• Mean difference — The mean difference is a measure of statistical dispersion equal to the average absolute difference of two independent values drawn from a probability distribution. A related statistic is the relative mean difference, which is the mean difference …   Wikipedia

• Science and mathematics from the Renaissance to Descartes — George Molland Early in the nineteenth century John Playfair wrote for the Encyclopaedia Britannica a long article entitled ‘Dissertation; exhibiting a General View of the Progress of Mathematics and Physical Science, since the Revival of Letters …   History of philosophy

• Deviation (statistics) — In mathematics and statistics, deviation is a measure of difference for interval and ratio variables between the observed value and the mean. The sign of deviation (positive or negative), reports the direction of that difference (it is larger… …   Wikipedia

• deviation — 1. A turning away or aside from the normal point or course. 2. An abnormality. 3. In psychiatry and the behavioral sciences, a departure from an accepted norm, role, or rule. SYN: deviance. 4. A statistical measure representing the …   Medical dictionary

• deviation — n. 1 a deviating, digressing. b an instance of this. 2 Polit. a departure from accepted (esp. Communist) party doctrine. 3 Statistics the amount by which a single measurement differs from the mean. 4 Naut. the deflection of a ship s compass… …   Useful english dictionary

• Standard deviation — In probability and statistics, the standard deviation is a measure of the dispersion of a collection of values. It can apply to a probability distribution, a random variable, a population or a data set. The standard deviation is usually denoted… …   Wikipedia