Everitt B.S. The Analysis of Contingency Tables

New York: Chapman and Hall/CRC, 1992. — 175 p.Much of the data collected in medicine and the social sciences is categorical, for example, sex, marital status, blood group, whether a smoker or not and so on, rather than interval-scaled. Frequently the researcher collecting such data is interested in the relationships or associations between pairs, or between a set of such categorical variables;