期刊
PSYCHOLOGICAL METHODS
卷 12, 期 2, 页码 121-138出版社
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/1082-989X.12.2.121
关键词
centering; grand mean centering; group mean centering; multilevel models; hierarchical linear models
Appropriately centering Level 1 predictors is vital to the interpretation of intercept and slope parameters in multilevel models (MLMs). The issue of centering has been discussed in the literature, but it is still widely misunderstood. The purpose of this article is to provide a detailed overview of grand mean centering and group mean centering in the context of 2-level MLMs. The authors begin with a basic overview of centering and explore the differences between grand and group mean centering in the context of some prototypical research questions. Empirical analyses of artificial data sets are used to illustrate key points throughout. The article provides a number of practical recommendations designed to facilitate centering decisions in MLM applications.
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