回复 10楼 mostwanted 的帖子# I' K$ U! z5 V4 c
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- U2 u, B1 p2 t! d) L& J 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& p/ L ?# w6 Y) y2 y( l
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In this test of the cross-level moderation, I have centered mood around its group mean.
2 T) A8 o! C4 P- V6 ~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).( g# F. c$ H! \- i/ n4 P
More specifically, this allows one to separate out the cross-level interaction from a between group-interaction.% J3 Q2 c+ J q8 ?
Raudenbush (1989a,b) as well as5 |( T% z- ^/ l% C0 ^0 K
Hofmann and Gavin (1998) have recently discussed this in greater detail.( S( h- A w1 ]
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.
0 Q5 N9 @, K c. I# K1 wAve_mood is the average mood within each group (i.e., the mean mood for each group).( p1 ?$ D2 k$ J0 t5 r4 o. ]
We will discuss why this variable is included as a predictor of the intercept later in the session. ! _" V. f$ Z( P* D ?; z
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