Classification and regression trees

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for the 1993 model year.18 There are 93 cars and 25 variables. We let the Y variable be the type of drive train, which takes three values (rear, front, or four-wheel drive). The X variables are listed in Table 2. Three are unordered (manuf, type, and airbag, tak-ing 31, 6, and 3 values, respectively), two binary-

  Model, Classification