This chapter explains how to summarize and calculate statistics for categorical variables. Categorical data is normally summarized in a frequency table (for one variable) or contingency table (for two or more variables), which is a table showing the number of values in each category or in each combination of categories. Data summarized in this form is known as tabular data.
As well as summarizing your categorical data in a table, you may need to compare it with a hypothesized distribution using the chi-square goodness-of-fit test. You may also want to determine whether there is any association between two or more categorical ...