An independent variable which takes a small number 3 or 4) of discrete values is often termed a dummy variable.

Name: An independent variable which takes a small number 3 or 4) of discrete values is often termed a dummy variable.
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A dummy variable is a binary variable that indicates whether a separate categorical variable takes on a specific value. It is not defined by the number of discrete values it can take but rather is used to include categorical data in regression models.

An Independent Variable Which Takes a Small Number 3 or 4)