=+goal was to study market differentiation among brands.

(The Dirt on Bikes: An Illustration of CART Models for Brand Differentiation, Jiang Lu, Joseph B. Kadane, and Peter Boatwright). In Chapter 17, Exercises 41, 42, and 43 dealt with these data, but several bikes were removed from those data to simplify the analysis. Now we’ll take on the full set.13