12-39. Consider the wear data in Exercise 12-7. (a) Find the value of R2 when the model
Chapter 12, Problem 12-39(choose chapter or problem)
12-39. Consider the wear data in Exercise 12-7. (a) Find the value of R2 when the model uses the regressors x1 and x2. (b) What happens to the value of R2 when an interaction term x1x2 is added to the model? Does this necessarily imply that adding the interaction term is a good idea?
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