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One that takes the value 0 or 1 to indicate the absence or presence of some categorical effect that may be expected to shift the outcome
In regression analysis, a dummy variable (also known as indicator variable or just dummy) is one that takes a binary value (0 or 1) to indicate the absence or presence of some categorical effect that may be expected to shift the outcome. For example, if we were studying the relationship between biological sex and income, we could use a dummy variable to represent the sex of each individual in the ... Wikipedia