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A matrix used to display information in cells formed by the intersection of two or more categorical variables. Contingency tables are used to show the number and percentage of cases falling into different cells of the table and the relationships between variables. To check for relationships, one calculates percentages for the cell counts in the table. Column percentages add up to 100% for each column; row percentages add up to 100% for each row. To determine if two variables are related, follow these rules: (a) if examining column percentages, then make cell or group comparisons across the rows, and (b) if examining row percentages, then make comparisons down the columns. Relationships observed in contingency tables can be checked for statistical significance using the chi-square statistic. ...

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