Question

Consider the model: FEV1i = β0 + β1 SMOKEi + β2 (AGEi-10) + β3 SMOKEi(AGEi - 10) + εi Suppose β3 is not significantly different from 0. We therefore drop the interaction term. How do we determine whether SMOKE is a confounder of the relationship between AGE and FEV1?

Group of answer choices

A. Compare the coefficient of AGE when SMOKE is in the model and when SMOKE is removed from the model.

B. Determine if the coefficient of SMOKE is meaningfully different from 0.

C. Compare the coefficient of SMOKE when the interaction term is in the model and when interaction term is removed from the model.

D. None of the above

Answer 1

To determine whether SMOKE is a confounder of the relationship between AGE and FEV1:

Compare the coefficient of AGE when SMOKE is in the model and when SMOKE is removed from the model