On Effect Size
On Effect Size
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DOI：
10.1037/a0028086
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发表时间：
2012-06-01
影响因子：
7
通讯作者：
Preacher, Kristopher J.
中科院分区：
文献类型：
--
作者：
Kelley, Ken;Preacher, Kristopher J.
要求研究人员报告和解释效应大小及其相应置信区间的呼声从未如此强烈。然而，文献中对效应量的定义存在混乱，因此该术语的使用不一致。我们提出了效应大小的定义，讨论了效应大小的 3 个方面（维度、度量/指数和值），概述了根据我们的定义得出的 10 个推论，并回顾了效应大小的理想品质。我们对效应大小的定义是通用的，并且包含许多现有的效应大小定义。我们将效应大小定义为对某些现象大小的定量反映，用于解决感兴趣的问题。我们对效应大小的定义有意比许多人定义和概念化效应大小的方式更具包容性，并且在将效应大小与感兴趣的问题联系起来方面是独一无二的。此外，我们回顾了效应大小文献中的一些重要进展，并讨论了将效应大小与区间估计相结合的重要性，该区间估计承认效应大小的总体值估计的不确定性。我们希望本文能够促进讨论并改进报告和解释效应量的实践。
The call for researchers to report and interpret effect sizes and their corresponding confidence intervals has never been stronger. However, there is confusion in the literature on the definition of effect size, and consequently the term is used inconsistently. We propose a definition for effect size, discuss 3 facets of effect size (dimension, measure/index, and value), outline 10 corollaries that follow from our definition, and review ideal qualities of effect sizes. Our definition of effect size is general and subsumes many existing definitions of effect size. We define effect size as a quantitative reflection of the magnitude of some phenomenon that is used for the purpose of addressing a question of interest. Our definition of effect size is purposely more inclusive than the way many have defined and conceptualized effect size, and it is unique with regard to linking effect size to a question of interest. Additionally, we review some important developments in the effect size literature and discuss the importance of accompanying an effect size with an interval estimate that acknowledges the uncertainty with which the population value of the effect size has been estimated. We hope that this article will facilitate discussion and improve the practice of reporting and interpreting effect sizes.