Statistics Dictionary

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Quantitative Variable

Variables can be classified as categorical (aka, qualitative) or quantitative (aka, numerical).

  • Categorical. Categorical variables take on values that are names or labels. The color of a ball (e.g., red, green, blue) or the breed of a dog (e.g., collie, shepherd, terrier) would be examples of categorical variables.
  • Quantitative. Quantitative variables are numerical. They represent a measurable quantity. For example, when we speak of the population of a city, we are talking about the number of people in the city - a measurable attribute of the city. Therefore, population would be a quantitative variable.

In algebraic equations, quantitative variables are represented by symbols (e.g., x, y, or z).

See also:  AP Statistics Tutorial: Variables