The SAS System 05:51 Wednesday, December 29, 2011 41 The REG Procedure Model: MODEL1 Dependent Variable: y Stepwise Selection: Step 1 Variable x4 Entered: R-Square = 0.9780 and C(p) = . Analysis of Variance Sum of Mean Source DF Squares Square F Value Pr > F Model 1 1647.36999 1647.36999 2574.90 <.0001 Error 58 37.10721 0.63978 Corrected Total 59 1684.47719 Parameter Standard Variable Estimate Error Type II SS F Value Pr > F Intercept 0.77128 0.18516 11.10063 17.35 0.0001 x4 1.30354 0.02569 1647.36999 2574.90 <.0001 Bounds on condition number: 1, 1 ------------------------------------------------------------------------------------------------ Stepwise Selection: Step 2 Variable x5 Entered: R-Square = 1.0000 and C(p) = . Analysis of Variance Sum of Mean Source DF Squares Square F Value Pr > F Model 2 1684.47719 842.23860 Infty <.0001 Error 57 0 0 Corrected Total 59 1684.47719 The SAS System 05:51 Wednesday, December 29, 2011 42 The REG Procedure Model: MODEL1 Dependent Variable: y Stepwise Selection: Step 2 Parameter Standard Variable Estimate Error Type II SS F Value Pr > F Intercept 3.99328E-15 0 2.29046E-28 Infty <.0001 x4 1.00000 0 284.54590 Infty <.0001 x5 1.00000 0 37.10721 Infty <.0001 Bounds on condition number: 3.4072, 13.629 ------------------------------------------------------------------------------------------------ Variable selection terminated as the selected model is a perfect fit. Summary of Stepwise Selection Variable Variable Number Partial Model Step Entered Removed Vars In R-Square R-Square C(p) F Value Pr > F 1 x4 1 0.9780 0.9780 . 2574.90 <.0001 2 x5 2 0.0220 1.0000 . Infty <.0001