9.2 Recall Example 9.1. Use cross validation by excluding one observation at a time from the data and estimate the optimal value of the window width ???? by minimizing PRESS, the prediction error sum of squares.

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Table 9.2 A Plackett-Burman design with 12 runs and four unused columns. Run A B C D E F G 1 1 1 1 Empty columns 1 123456789012 10 12 1 1 -1 1 1 1 TT -1