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equal 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-to-mean ratio — In probability theory and statistics, the variance to mean ratio (VMR), like the coefficient of variation, is a measure of the dispersion of a probability distribution. It is defined as the ratio of the variance sigma^2 to the mean mu ::… …   Wikipedia

  • variance — n. 1 difference of opinion; dispute, disagreement; lack of harmony (at variance among ourselves; a theory at variance with all known facts). 2 Law a discrepancy between statements or documents. 3 Statistics a quantity equal to the square of the… …   Useful english dictionary

  • variance — noun 1》 (usu. in phr. at variance with) the fact or quality of being different or inconsistent.     ↘the state of disagreeing or quarrelling.     ↘chiefly Law a discrepancy between two statements or documents. 2》 US Law an official dispensation… …   English new terms dictionary

  • 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

  • Algorithms for calculating variance — play a major role in statistical computing. A key problem 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… …   Wikipedia

  • Minimum-variance unbiased estimator — In statistics a uniformly minimum variance unbiased estimator or minimum variance unbiased estimator (UMVUE or MVUE) is an unbiased estimator that has lower variance than any other unbiased estimator for all possible values of the parameter. The… …   Wikipedia

  • Gender variance — is a term that refers to those expressions of gender (masculinity and femininity) that do not conform to the dominant gender norms of Western culture. The term is used by scholars of psychology [Lynne Carroll, Paula J. Gilroy, Jo Ryan (2002),… …   Wikipedia

  • Kruskal-Wallis one-way analysis of variance — In statistics, the Kruskal Wallis one way analysis of variance by ranks (named after William Kruskal and W. Allen Wallis) is a non parametric method for testing equality of population medians among groups. Intuitively, it is identical to a one… …   Wikipedia

  • analysis of variance — noun a statistical method for making simultaneous comparisons between two or more means; a statistical method that yields values that can be tested to determine whether a significant relation exists between variables • Syn: ↑ANOVA • Topics:… …   Useful english dictionary

  • Student's t-test — A t test is any statistical hypothesis test in which the test statistic follows a Student s t distribution if the null hypothesis is supported. It is most commonly applied when the test statistic would follow a normal distribution if the value of …   Wikipedia

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