Correspondence Analysis

Correspondence analysis provides tools for analyzing 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 \((2 \times 2)\) 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 \((n \times p)\) tables may be considered.