Categorical variable

In statistics , the following types of variables are called categorical variables :

• nominal scaled variables
• ordinal scaled variables
• metric variables that have only a few characteristics .
  Some authors include scale variables in the case of a few forms or categorization is not the categorical variables. The narrow definition of the term “categorical variable” then only includes nominally and ordinally scaled variables.
• Metric variables that have been categorized (example: variable “income” with the categories “500–999 €”, “1000–1499 €” etc.)

See also

• Cardinal variable or metric variable
• Scale level

literature

• Ludwig Fahrmeir , Rita artist, Iris Pigeot , Gerhard Tutz : Statistics. The way to data analysis. 8., revised. and additional edition. Springer Spectrum, Berlin / Heidelberg 2016, ISBN 978-3-662-50371-3