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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7 D% T0 Q2 A! M- z8 \
4 d4 `8 n! B0 W/ lIn this test of the cross-level moderation, I have centered mood around its group mean.4 K* |/ u# I# [/ O$ E4 l
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).
: ]& Y& f' B* s, dMore specifically, this allows one to separate out the cross-level interaction from a between group-interaction.4 _1 f+ q1 V. M
Raudenbush (1989a,b) as well as
1 e) d6 ^0 v h( s1 wHofmann and Gavin (1998) have recently discussed this in greater detail.
! I* w7 {; I6 x! O( z; FWe 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.
9 R5 Z6 i0 q, w* V6 U2 kAve_mood is the average mood within each group (i.e., the mean mood for each group).' D& `/ z8 e" y
We will discuss why this variable is included as a predictor of the intercept later in the session. 3 @5 O5 J# b1 T) ]
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楼主: Gaolp
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发表于 2010-9-30 02:22:26
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