Comparing Interpoint Distances in Correspondence Analysis: A Clarification
澄清了对应分析中两种不同缩放方法的关系，并利用Greenacre的数据集比较了三种缩放方案在概念和实证上的差异，帮助研究者正确进行组内和组间距离比较。
In a recent JMR article, the authors described and illustrated a correspondence analysis scaling that permitted both within-set and between-set squared distance comparisons. This note clarifies the relationship between the proposed scaling and another scaling (popular among the “French school” of data analysts) in which the diagonal matrix of singular values is applied to both X and Y coordinates. Using a data set from Greenacre, the authors examine conceptual and empirical contrasts among three alternative scalings.