G02EEF Example Program Results Step 1 Added variable is TS Change in residual sum of squares = 0.4713E+00 F Statistic = 7.38 Variables in model: COD TS Residual sum of squares = 0.1085E+01 Degrees of freedom = 17 Free variables: TKN BOD TVS Change in residual sums of squares for free variables: 0.1175 0.0600 0.2276 Step 2 No further variables added maximum F = 1.59 Free variables: TKN BOD TVS Change in residual sums of squares for free variables: 0.0979 0.0207 0.0217