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A Researcher Had a Categorical Variable That They Wanted to Include

Question 21

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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 control category.Which of the following represents the correct coding scheme?


A) 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 control category.Which of the following represents the correct coding scheme? A) B) C) D)
B) 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 control category.Which of the following represents the correct coding scheme? A) B) C) D)
C) 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 control category.Which of the following represents the correct coding scheme? A) B) C) D)
D) 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 control category.Which of the following represents the correct coding scheme? A) B) C) D)

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