Correspondence Analysis

Abstract

Correspondence analysis provides tools for analysing the associations between rows and columns of contingency tables. A contingency table is a two-entry frequency table where the joint frequencies of two qualitative variables are reported. For instance a (2 {\texttimes} 2) table could be formed by observing from a sample of n individuals two qualitative variables: the individual's sex and whether the individual smokes. The table reports the observed joint frequencies. In general (n {\texttimes} p) tables may be considered.