ch-12 - fx8203 - CHAPTER 12 Kishan Ashok Savani fx8203...

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CHAPTER 12 Kishan Ashok Savani – fx8203 12-74. a) 1 . 8 2 R % b) Assumption of normality appears is not adequate. Residual Percent 1.5 1.0 0.5 0.0 -0.5 -1.0 99 95 90 80 70 60 50 40 30 20 10 5 1 Normal Probability Plot of the Residuals (response is ARSNAILS) c) The graphs indicate non-constant variance. Therefore, the model is not adequate. Fitted Value Standardized Residual 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 4 3 2 1 0 -1 Residuals Versus the Fitted Values (response is ARSNAILS)
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AGE Residual 90 80 70 60 50 40 30 20 10 0 1.5 1.0 0.5 0.0 -0.5 Residuals Versus AGE (response is ARSNAILS) DRINKUSE Residual 5 4 3 2 1 1.5 1.0 0.5 0.0 -0.5 Residuals Versus DRINKUSE (response is ARSNAILS) COOKUSE Residual 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 Residuals Versus COOKUSE (response is ARSNAILS)
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12-100. a) Best Subsets Regression: Y-Ex12-12 AR versus X1 AGE, X3- DRINKUSE, ... Response is Y-Ex12-12 ARSNAILS X 3 - X 4 D R C X I O 1 N O K K A U U Mallows G S S Vars R-Sq R-Sq(adj) Cp S E E E 1 7.9 3.0 0.0 0.47940 X 1 0.1 0.0 1.5 0.49931 X 2 8.1 0.0 2.0 0.49198 X X The min C p equation is: x 1 0 . 0 p C and 4794 . 0 s 1 00850 . 0 038 . 0 ˆ x y The min E MS model is the same as the min C p model The full model that contains all 3 variables 3 2 1 010 . 0 021 . 0 00858 . 0 001 . 0 ˆ x x x y where
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