Regression away from the mean: Theory and examples.

Regression away from the mean: Theory and examples.
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远离均值的回归:理论和例子

DOI:
10.1111/bmsp.12106
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发表时间:
2018
期刊:
The British journal of mathematical and statistical psychology
影响因子:
--
通讯作者:
Schwarz
Schwarz
中科院分区:
--
文献类型:
--
作者:
Schwarz

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使用具有任意真分数分布和正态误差变量的标准重复测量模型,我们给出了一些基本的闭合结果,这些结果清楚地表明了回归效果向(RTM)和远离均值的预期条件。具体地说,我们证明了对于偏态分布和双峰分布,许多甚至大多数情况都会表现出预期偏离平均值的回归效应,或者不仅是朝向平均值,而且实际上超出了平均值。我们用实验和生物统计学应用中的典型例子来说明我们的结果的量化细节,这些例子显示出明显背离平均(从平均向外回归)签名的回归。我们的目标不是废除对潜在RTM效应的警示建议,而是基于对回归效应在重复测量设计中采用的形式的明确识别,提出对回归效应的平衡观点。
Using a standard repeated measures model with arbitrary true score distribution and normal error variables, we present some fundamental closed‐form results which explicitly indicate the conditions under which regression effects towards (RTM) and away from the mean are expected. Specifically, we show that for skewed and bimodal distributions many or even most cases will show a regression effect that is in expectation away from the mean, or that is not just towards but actually beyond the mean. We illustrate our results in quantitative detail with typical examples from experimental and biometric applications, which exhibit a clear regression away from the mean (‘egression from the mean’) signature. We aim not to repeal cautionary advice against potential RTM effects, but to present a balanced view of regression effects, based on a clear identification of the conditions governing the form that regression effects take in repeated measures designs.
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