回复 10楼 mostwanted 的帖子3 w% E) L3 s0 j" @. B& r: l) _# E1 j
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j I6 B% s4 G/ @3 R) T) Q 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9 C( H: c0 s2 f) M; B9 y& t
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In this test of the cross-level moderation, I have centered mood around its group mean." i( X* h4 d7 C+ M4 j8 ?1 ]
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).1 N- p4 r! r" }1 m4 z
More specifically, this allows one to separate out the cross-level interaction from a between group-interaction.. ]2 v* L( V) F; F1 g
Raudenbush (1989a,b) as well as
% j l) R1 ]" A4 \$ G# n( _6 IHofmann and Gavin (1998) have recently discussed this in greater detail.1 n4 ]; I( u6 C' l* t% t1 l7 M
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.
' P! |5 j2 \+ k) @9 [, jAve_mood is the average mood within each group (i.e., the mean mood for each group).
, y) ?1 i, Q& J6 AWe will discuss why this variable is included as a predictor of the intercept later in the session.
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