In order to incorporate the marital status variable into a multiple regression model, there are four possible categories for this variable: married, single, divorced, or widowed. Based on this information, four indictor variables will need to be created (one for each category) and incorporated into the regression model.

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In multiple regression, if a categorical variable has four categories, only three indicator (dummy) variables are needed. The fourth category serves as the reference group.

In Order to Incorporate the Marital Status Variable into a Multiple