Definition, Betydelse & Synonymer | Engelska ordet VARIANCE

Definition av VARIANCE

1. varians

Exempel på hur man kan använda VARIANCE i en mening

• Analysis of variance (ANOVA) is a collection of statistical models and their associated estimation procedures (such as the "variation" among and between groups) used to analyze the differences among means.
• A key difficulty in the design of good algorithms for this problem is that formulas for the variance may involve sums of squares, which can lead to numerical instability as well as to arithmetic overflow when dealing with large values.
• Using a mechanism known as the "snake in the tunnel", the European Exchange Rate Mechanism was an attempt to minimize fluctuations between member state currencies—initially by managing the variance of each against its respective ECU reference rate—with the aim to achieve fixed ratios over time, and so enable the European Single Currency (which became known as the euro) to replace national currencies.
• In probability theory and statistics, variance is the expected value of the squared deviation from the mean of a random variable.
• The Allan variance (AVAR), also known as two-sample variance, is a measure of frequency stability in clocks, oscillators and amplifiers.
• In discrete time, white noise is a discrete signal whose samples are regarded as a sequence of serially uncorrelated random variables with zero mean and finite variance; a single realization of white noise is a random shock.
• The Box–Muller transform, by George Edward Pelham Box and Mervin Edgar Muller, is a random number sampling method for generating pairs of independent, standard, normally distributed (zero expectation, unit variance) random numbers, given a source of uniformly distributed random numbers.
• In machine learning (ML), boosting is an ensemble metaheuristic for primarily reducing bias (as opposed to variance).
• This variation could be a result of unequal sex ratios, high variance in family size, inbreeding, or fluctuating population size.
• It is also a component of the definition of the t-distribution and the F-distribution used in t-tests, analysis of variance, and regression analysis.
• This climatic region is typified by wide seasonal temperature variance, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters with large amounts of snowfall.
• Proposed deviations from the Zoning Code require the approval of a "variance" by the City Council, which takes into consideration the recommendations of the Planning Commission, staff, and members of the public.
• Both the Regnal List and Chronicle were put into their present form in the late ninth century, probably at the court of Alfred the Great, and show scholars at pains both to emphasise that all West-Saxon kings descended from Cerdic and to put Cerdic's foundation of the dynasty earlier than their sources claimed, yet nonetheless are often at variance.
• However, a biased estimator with a small variance may be more useful than an unbiased estimator with a large variance.
• Beta in this context is calculated as the covariance of the portfolio's returns with its benchmark's returns, divided by the variance of the benchmark's returns.
• In statistics, the Gauss–Markov theorem (or simply Gauss theorem for some authors) states that the ordinary least squares (OLS) estimator has the lowest sampling variance within the class of linear unbiased estimators, if the errors in the linear regression model are uncorrelated, have equal variances and expectation value of zero.
• Uncorrelated random variables have a Pearson correlation coefficient, when it exists, of zero, except in the trivial case when either variable has zero variance (is a constant).
• For example, isotropic properties do not change with the direction of observation, and anisotropic properties do have spatial variance.
• In probability theory and statistics, a covariance matrix (also known as auto-covariance matrix, dispersion matrix, variance matrix, or variance–covariance matrix) is a square matrix giving the covariance between each pair of elements of a given random vector.
• In comparison, parental socioeconomic status and the child's sex explained about 23% of the variance in IQ.

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