η2是什么意思

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有的的统计报告在进行方差分析时，会报告η2值，有谁知道这个η2是什么，在什么场合下使用？

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关键词：是什么意思 方差分析 统计报告 意思

Effect size measures

Several standardised measures of effect are used within the context of ANOVA to describe the degree of relationship between an predictor or set of predictors and the dependent variable.

η2: Eta-squared Eta-squared describes the percentage of variance explained in the dependent variable by a predictor variable. It is a biased estimate of population variance explained.

partial η2: Partial eta-squared Partial eta-squared describes the percentage of variance explained in the dependent variable by a predictor controlling for other predictors. It is a biased estimate of the variance explained in the population. The following rules of thumb have emerged: small = 0.01; medium = 0.06; large = 0.14 These rules were taken from: Kittler, J. E., Menard, W., & Phillips, K., A. (2007). Weight concerns in individuals with body dysmorphic disorder. Eating Behaviors, 8, 115-120.

Omega Squared: Omega squared provides a relatively unbiased estimate of the variance explained in the population by a predictor variable.

Cohen's f This measure of effect size is frequently encountered when performing power analysis calculations. Conceptually it represents the square root of variance explained over variance not explained

http://en.wikipedia.org/wiki/Analysis_of_variance