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Categorical variable
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==Examples of categorical variables== Examples of values that might be represented in a categorical variable: *Demographic information of a population: gender, disease status. *The [[blood type]] of a person: A, B, AB or O. *The [[political party]] that a voter might vote for, e.{{nnbsp}}g. ''Green Party'', ''Christian Democrat'', ''Social Democrat'', etc. *The type of a rock: [[igneous]], [[sedimentary]] or [[Metamorphic rock|metamorphic]]. *The identity of a particular word (e.g., in a [[language model]]): One of ''V'' possible choices, for a vocabulary of size ''V''.
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