nag_full_step_regsn (g02efc) Example Program Results Starting Stepwise Selection Forward Selection Variable 1 Variance ratio = 1.260E+01 Variable 2 Variance ratio = 2.196E+01 Variable 3 Variance ratio = 4.403E+00 Variable 4 Variance ratio = 2.280E+01 Adding variable 4 to model Backward Selection Variable 4 Variance ratio = 2.280E+01 Keeping all current variables Forward Selection Variable 1 Variance ratio = 1.082E+02 Variable 2 Variance ratio = 1.725E-01 Variable 3 Variance ratio = 4.029E+01 Adding variable 1 to model Backward Selection Variable 1 Variance ratio = 1.082E+02 Variable 4 Variance ratio = 1.593E+02 Keeping all current variables Forward Selection Variable 2 Variance ratio = 5.026E+00 Variable 3 Variance ratio = 4.236E+00 Adding variable 2 to model Backward Selection Variable 1 Variance ratio = 1.540E+02 Variable 2 Variance ratio = 5.026E+00 Variable 4 Variance ratio = 1.863E+00 Dropping variable 4 from model Forward Selection Variable 3 Variance ratio = 1.832E+00 Variable 4 Variance ratio = 1.863E+00 Finished Stepwise Selection Fitted Model Summary Term Estimate Standard Error Intercept: 5.258e+01 2.294e+00 Variable: 1 1.468e+00 1.213e-01 Variable: 2 6.623e-01 4.585e-02 RMS: 5.790e+00