Moderating Effects of Subgroups in Linear Models
本文讨论了子群变量对关联强度或方向的调节效应，给出了线性模型中包含三个变量时的有向关联度量公式。
Possibilities for moderating effects of a subgrouping variable on strength or direction of an association have been much discussed by social scientists but have not been given satisfactory statistical formulations. The results concern directed measures of associations in linear models containing just three variables.