A researcher had a categorical variable that they wanted to include as a predict

Question

A researcher had a categorical variable that they wanted to include as a predictor in a regression equation. The researcher was trying to predict the success of a back pain intervention, and the categorical variable was the duration of the back pain prior to treatment, with 4 categories: less than 6 months, 6–12 months, 1–2 years, more than 2 years. They needed to code these variables into dummy variables for the regression using less than 6 months as their reference category.

How should the correct coding scheme be represented?

Explanation / Answer

Class interval less than 6 months can be considered as 0-6 months

Coded value may be taken as mid value of this interval.

Mid value= (0+6)/2 = 3

Similarly for 6-12 months mid value= (6+12)/2= 9

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