FITTING GOMPERTZ CURVES

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We use data from a different cow to illustrate fitting this curve 

***** Nonlinear regression analysis *****

 Response variate: weight
      Explanatory: age
     Fitted Curve: A + C*EXP(-EXP(-B*(X-M)))
      Constraints: C > 0

*** Estimates of parameters ***

                  estimate         s.e.
B                 0.031022     0.000848
M                    35.63         1.57
C                    664.7         19.3
A                      8.2         17.5

*** Summary of analysis ***

              d.f.         s.s.         m.s.      v.r.
Regression       3     2545361.    848453.69  12336.39
Residual        78        5365.        68.78
Total           81     2550726.     31490.44

Percentage variance accounted for 99.8
Standard error of observations is estimated to be 8.29

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Growth curve modelling 1.6.95 Page : 8 of 12