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. E0 ]: w& `1 d 谢谢你的建议和参考文献;怎么我读到的文章只是提到如果有cross level的调节作用的话,考虑用group mean centering,其他的一般都用grand mean centering呢?描述如下. \5 z5 v/ f4 q# i. i7 }
1 ?# N+ T9 p1 l! B+ _6 K0 V; tIn this test of the cross-level moderation, I have centered mood around its group mean.6 {2 t A* y9 D6 W) G9 e
There are some arguments in the literature that group mean centering is a better choice of scaling for the level-1 variables when investigating cross-level interactions (i.e., moderation).
; `8 i: V3 ?: V/ EMore specifically, this allows one to separate out the cross-level interaction from a between group-interaction.1 A! Q$ r' m& M: q6 _1 `
Raudenbush (1989a,b) as well as
$ ~' u6 q( \( gHofmann and Gavin (1998) have recently discussed this in greater detail. d( \$ n$ x' ~0 Q! `: J; x
We will demonstrate this notion later in the session. Note that, in addition to group mean centering, this model also includes an additional predictor of the intercept; namely, ave_mood.3 i) A6 {8 _7 i9 \1 g
Ave_mood is the average mood within each group (i.e., the mean mood for each group).
5 f& s( k* ^; @1 i/ X; f! c w. ^We will discuss why this variable is included as a predictor of the intercept later in the session.
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