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Learning pandas - Second Edition by Michael Heydt

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Categorical

A categorical variable is a variable that can take on one of a limited, and usually fixed, number of possible values. Each of the possible values is often referred to as a level. Categorical variables in pandas are represented by Categoricals, a pandas data type which corresponds to categorical variables in statistics. Examples of categorical variables are gender, social class, blood types, country affiliations, observation time, or ratings such as Likert scales.

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