Question

Dummy or indicator variables typically are values of zero or one and are used to model the effects of different levels of ___________ variables.

Answer 1

Dummy or indicator variables typically are values of zero or one and are used to model the effects of different levels of qualitative variables. A qualitative variable, also referred to as a category variable, is a non-numerical variable. It describes information that can be categorized.

Examples include: Eye color (variables include: blue, green, brown, hazel). Qualitative variables, also referred to as category variables, are variables without a built-in notion of hierarchy. As a result, they are quantified using a numerical scale. A qualitative variable is, for example, hair color (Black, Brown, Gray, Red, Yellow). Numerical variables are the subject of quantitative data.

To learn more about qualitative variables, click here.

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