The SAS System                              1
                                               15:01 Tuesday, March 20, 2018

                             The NLIN Procedure
                         Dependent Variable weight
                            Method: Gauss-Newton

                              Iterative Phase
                                                                Sum of
      Iter          b0          b1          b2          b3     Squares

         0      1.0000     -1.0000     -1.0000      1.0000    2.2958E9
         1       340.6     -1.0359     -1.0566     -2.2256    1.7924E9
         2      1475.6     -1.1558     -1.0535     -1.7301    4.9304E8
         3      2645.9     -1.2794     -1.0435     -1.4687     5070491
         4      2716.5     -1.2869     -1.0199     -2.6799     2728628
         5      2717.2     -1.2869     -0.9646    -10.1938     2639056
         6      2719.5     -1.2869     -0.7008    -66.4728     2394596
         7      2725.4     -1.2869      0.2490      -134.9     2141268
         8      2725.5     -1.2869      0.7100      -135.4     2004224
         9      2726.1     -1.2869      0.7486      -138.2     1947192
        10      2729.4     -1.2869      0.8856      -150.3     1495000
        11      2741.3     -1.2869      0.9673      -170.6      926834
        12      2786.8     -1.2869      0.9802      -231.2      675633
        13      2881.6     -1.2869      0.9851      -349.3      149391
        14      2911.7     -1.2869      0.9841      -385.0      1154.1
        15      2912.5     -1.2869      0.9842      -386.0      1122.4
        16      2912.5     -1.2869      0.9842      -386.0      1122.4
        17      2912.5     -1.2869      0.9842      -386.0      1122.4


      NOTE: Convergence criterion met.                                


                            Estimation Summary

                   Method                   Gauss-Newton
                   Iterations                         17
                   Subiterations                      13
                   Average Subiterations        0.764706
                   R                            3.089E-7
                   PPC(b3)                      1.198E-8
                   RPC(b3)                      6.822E-7
                   Object                        3.1E-10
                   Objective                    1122.435
                   Observations Read                 315
                   Observations Used                 315
                   Observations Missing                0
                               The SAS System                              2
                                               15:01 Tuesday, March 20, 2018

                             The NLIN Procedure

                                   Sum of        Mean               Approx
 Source                    DF     Squares      Square    F Value    Pr > F

 Model                      3     2910559      970186     268816    <.0001
 Error                    311      1122.4      3.6091                     
 Corrected Total          314     2911681                                 


                                      Approx     Approximate 95% Confidence
        Parameter      Estimate    Std Error               Limits

        b0               2912.5       1.1481      2910.3      2914.8
        b1              -1.2869      0.00495     -1.2966     -1.2771
        b2               0.9842     0.000091      0.9840      0.9843
        b3               -386.0       0.9598      -387.9      -384.1


                       Approximate Correlation Matrix
                     b0              b1              b2              b3

     b0       1.0000000      -0.2805379       0.9346988      -0.9184283
     b1      -0.2805379       1.0000000       0.0000000      -0.0000000
     b2       0.9346988       0.0000000       1.0000000      -0.8838217
     b3      -0.9184283      -0.0000000      -0.8838217       1.0000000