作者: Zhi Geng
DOI: 10.1111/J.2517-6161.1992.TB01898.X
关键词:
摘要: We consider the collapsibility of relative risks in contingency tables with a polytomous response variable. Simple means that they are consistent over all levels collapsed variable and also coincide corresponding marginal risk. Strong retain simple no matter how is partially collapsed. present necessary sufficient conditions for strong collapsibilities