Categorial Data

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Definition

Categorial data are presented in a contigency table. It is a way of summarizing the relationship between variables. A contingency table usually shows frequencies for particular combinations of values of two discrete random variables X and Y, i. e., the joint frequency distributions of variables X and Y. Each cell in the table represents a mutually exclusive combination of X-Yvalues. The values in the rows of a contingency table are contingent upon (dependent upon) the values in the columns. Sometimes three-way (and more) contingency tables are used.