- For the model in Question 11, is a test for the
significance of the two-factor product term SMK
NS dependent on the coding of SMK? If so, explain
why; if not, explain why not. - For the model in Question 11, briefly describe a
hierarchical backward elimination procedure for
obtaining a best model. - Suppose that the three-factor product term SMKNS
AS is found significant during the interaction
assessment stage of the analysis. Then, using the
hierarchy principle, what other interaction terms
must remain in any further model considered? Also,
using the hierarchy principle, what potential
confounders must remain in any further models
considered? - Assuming the scenario described in Question 15 (i.e.,
SMKNSAS is significant), what (reduced) model
remains after the interaction assessment stage of the
model? Are there any potential confounders that are
still eligible to be dropped from the model? If so,
which ones? If not, why not?
200 6. Modeling Strategy Guidelines