Variance - Wikipedia, the free encyclopedia
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In probability theory and statistics, the variance of a random variable or distribution is the expected square deviation of that variable from its expected value or mean. For example, a perfect die,...
en.wikipedia.org/wiki/Variance
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Allan variance - Wikipedia, the free encyclopedia
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 , and written σ y ²( τ ). It is defined...
en.wikipedia.org/wiki/Allan_variance
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This is part of HyperStat Online, a free online statistics book. ... The variance and the closely-related standard deviation are measures of how spread out a distribution is. In other words, they are measures of variability. The variance is computed as the average squared deviation of each number from its mean.
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davidmlane.com/hyperstat/A16252.html
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Internet Glossary of Statistical Terms by Dr. Howard S. Hoffman ... To calculate the variance of a given population, it is necessary to first calculate the mean of the scores, then measure the amount that each score deviates from the mean and then square that deviation (by multiplying it by itself).
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www.animatedsoftware.com/statglos/sgvarian.htm
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variance - definition of variance - A measure of the average distance between each of a set of data points and their mean value; equal to the sum of the squares of the deviation from... ... portfolio variance...
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www.investorwords.com/5227/variance.html
www.investorwords.com/5227/variance.html
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Variance and Standard Deviation ... Both variance and standard deviation measures variability within a distribution. Standard deviation is a number that indicates how much on average each of the values in the distribution deviates from the mean (or center) of the distribution.
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faculty.uncfsu.edu/dwallace/ssandrd.html
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To obtain the variance start by subtracting the average from each data item. Since there will be about as many items above average as below average, the resulting list of numbers will have about as many positive values as negative values.
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www.physics.csbsju.edu/stats/descriptive2.html
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Variance (of a sample) is defined as ... Once we divide the Sums of Squares by N-1 we get the sample variance which can be thought of as an averaged sums of squares. While important in statistical theory and in many statistical computations, it has the problem of being in squared units and is therefore difficult to...
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www.une.edu.au/WebStat/unit_materials/c4_descriptive_st...
www.une.edu.au/WebStat/unit_materials/c4_descriptive_statistics/variance.htm
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[vâŕē-əns, văŕ-]
