What is contingency table? What is their use in epidemiological research?

A contingency table is a statistical tool used to display the frequency distribution of variables and analyze the relationship between two or more categorical variables. It organizes data into rows and columns, where each cell represents the count of occurrences of a particular combination of categories. Contingency tables can _____ ____ __________ _____ ___ ______ __________ _______ _______ _____.
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