Correspondence analysis of aggregate data: The 2×2 table

This paper will provide a graphical investigation of the problem. In particular we will demonstrate the applicability of correspondence analysis on a single 2×2 table where the joint cell frequencies are not available, but where only the marginal information is known. To complement this approach an aggregate association index is proposed to determine, based only on the availability of the aggregate data, whether there is any possibility of there existing a significant association between the two dichotomous variables arising from the table.