RESIDUALS FROM GENERALISED LOGISTIC

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It is useful to look at a plot of residuals versus fitted values. Clearly the residuals are not randomly distributed about zero. This is because observations over time are correlated, and the cows weight fluctuates about the fitted curve. Unless these fluctuations are of interest, we will not attempt to model them. 
       -+---------+---------+---------+---------+-----
       I                             *               I
   2.5 I                              *              I
       I                             *     *         I
       I                                   3         I
       I                            ***    3         I
       I          ** *            *2* 2 * 24         I
       I    *    * *****          * 2* *  26*        I
   0.0 I     *  **    * **  * * ***    *2 **         I
       I      ***       * 2 *** 2* *   *2*24         I
       I      *            2 * 2        *22 *        I
       I                                 *3 2        I
       I                 *             ***           I
       I                                 3  *        I
  -2.5 I                                             I
       I                               *             I
       I                                             I
       I                                             I
       I                                             I
       I                                             I
  -5.0 I                                             I
       -+---------+---------+---------+---------+-----
      0.0     200.0     400.0     600.0     800.0

                   res  v. fit using symbol *

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Growth curve modelling 1.6.95 Page : 6 of 12