con vs cat

  1. J

    Continuous vs categorical variable in regression

    Dear all, In doing regression analysis, I am sometimes confused with whether I should use a continuous predictor variable (e.g., age in years) or re-group it into a categorical variable (e.g., 5 age groups: 18 to 24, 25 to 34, 35 to 44, 45 to 54, and 55+). What is the best way to decide? Any...