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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
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In this test of the cross-level moderation, I have centered mood around its group mean.
7 L x: T' d. v$ T, DThere 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).
: D+ B4 u+ w; g1 M. w' vMore specifically, this allows one to separate out the cross-level interaction from a between group-interaction.
# @+ s; F5 U: F4 WRaudenbush (1989a,b) as well as
% w) c- \7 S0 H" DHofmann and Gavin (1998) have recently discussed this in greater detail.' ^* ~) @* p3 `. d5 L; N7 U, j
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.
) E3 z4 Z* O4 cAve_mood is the average mood within each group (i.e., the mean mood for each group).) P$ L, P$ i" K3 q( t6 V$ p1 y8 }
We will discuss why this variable is included as a predictor of the intercept later in the session. % Q/ C8 N1 s# h. f, B2 b! _- w
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发表于 2010-9-30 02:22:26
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