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average variance

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  • Variance — In probability theory and statistics, the variance of a random variable, probability distribution, or sample is one measure of statistical dispersion, averaging the squared distance of its possible values from the expected value (mean). Whereas… …   Wikipedia

  • variance — Statistical term that quantifies the dispersion of data such as rates or prices around the mean. For example, highly volatile rates are rates that are sometimes high above the mean and sometimes way below the mean. Less volatile rates are… …   Financial and business terms

  • Variance — A measure of the dispersion of a set of data points around their mean value. Variance is a mathematical expectation of the average squared deviations from the mean. Variance measures the variability (volatility) from an average. Volatility is a… …   Investment dictionary

  • Average — In mathematics, an average, or central tendency[1] of a data set is a measure of the middle value of the data set. Average is one form of central tendency. Not all central tendencies should be considered definitions of average. There are many… …   Wikipedia

  • variance — 1. The state of being variable, different, divergent, or deviate; a degree of deviation. 2. A measure of the variation shown by a set of observations, defined as the sum of squares of deviations from the mean, divided by the number of degrees of… …   Medical dictionary

  • variance —    A measure of the variation around the central class of a distribution; the average squared deviation of the observation from their mean value …   Forensic science glossary

  • Moving average — For other uses, see Moving average (disambiguation). In statistics, a moving average, also called rolling average, rolling mean or running average, is a type of finite impulse response filter used to analyze a set of data points by creating a… …   Wikipedia

  • Analysis of variance — In statistics, analysis of variance (ANOVA) is a collection of statistical models, and their associated procedures, in which the observed variance in a particular variable is partitioned into components attributable to different sources of… …   Wikipedia

  • Allan variance — The Allan variance, named after David W. Allan, is a measurement of stability in clocks and oscillators. It is also known as the two sample variance.It is defined as one half of the time average of the squares of the differences between… …   Wikipedia

  • Autoregressive moving average model — In statistics, autoregressive moving average (ARMA) models, sometimes called Box Jenkins models after the iterative Box Jenkins methodology usually used to estimate them, are typically applied to time series data.Given a time series of data X t …   Wikipedia

  • Modified Allan variance — The modified Allan variance (MAVAR) [1], also known as mod σy2(τ), is a variable bandwidth modified variant of Allan variance, a measurement of frequency stability in clocks, oscillators and amplifiers. Its main advantage relative to Allan… …   Wikipedia

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