Which model would you select? Explain your choice and the criteria used to reach your decision.

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14.53 The article "The Analysis and Selection of
Variables in Linear Regression" (Biometrics [1976]: 1-
49) reports on an analysis of data taken from issues of
Motor Trend magazine. The dependent variable y was gas
mileage; there were n = 32 observations; and the inde-
pendent variables were x₁ = engine type (1 = straight,
0 = V), x₂ = number of cylinders, x3 = transmission
type (1 = manual, 0 = automatic), x4 = number of
transmission speeds, x, = engine size, x6 = horsepower,
x = number of carburetor barrels, xg = final drive ratio,
x9 = weight, and x₁0 = quarter-mile time. The R² and
adjusted R² values are given in the accompanying table
for the best model using k predictors for k = 1, ..., 10.
Which model would you select? Explain your choice and
the criteria used to reach your decision.
X10
k
1
2
3
4
5
6
7
8
9
10
Variables Included
X2, X9
X3, X9, X10
X3, X6 X9, X10
X3, X5, X6, X9, X10
X3, X5, X6 X8, X, X10
X3 X4 X5, X6, X8, X9, X10
X3 X4 X5, X6, X7, X8, X9, X10
X1, X3, X4, X5, X6 X7, X8, X9, X10
All independent
variables
R²
.756
.833
.852
.860
.866
.869
.870
.871
.871
.871
Adjusted R²
.748
.821
.836
.839
.840
.837
.832
.826
.818
.809
Transcribed Image Text:14.53 The article "The Analysis and Selection of Variables in Linear Regression" (Biometrics [1976]: 1- 49) reports on an analysis of data taken from issues of Motor Trend magazine. The dependent variable y was gas mileage; there were n = 32 observations; and the inde- pendent variables were x₁ = engine type (1 = straight, 0 = V), x₂ = number of cylinders, x3 = transmission type (1 = manual, 0 = automatic), x4 = number of transmission speeds, x, = engine size, x6 = horsepower, x = number of carburetor barrels, xg = final drive ratio, x9 = weight, and x₁0 = quarter-mile time. The R² and adjusted R² values are given in the accompanying table for the best model using k predictors for k = 1, ..., 10. Which model would you select? Explain your choice and the criteria used to reach your decision. X10 k 1 2 3 4 5 6 7 8 9 10 Variables Included X2, X9 X3, X9, X10 X3, X6 X9, X10 X3, X5, X6, X9, X10 X3, X5, X6 X8, X, X10 X3 X4 X5, X6, X8, X9, X10 X3 X4 X5, X6, X7, X8, X9, X10 X1, X3, X4, X5, X6 X7, X8, X9, X10 All independent variables R² .756 .833 .852 .860 .866 .869 .870 .871 .871 .871 Adjusted R² .748 .821 .836 .839 .840 .837 .832 .826 .818 .809
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