Data on five orange trees grown at Riverside, California. Measurements of the trunk circumference (in millimeters) were made on each of the trees at 7 different times. The times are given relative to the arbitrary origin of December 31, 1968.
This data frame contains the following columns:
These data are quoted in Draper and Smith (1981), Applied Regression Analysis, Wiley, New York (chapter 10, exercise N, page 524).
Orange.lis <- nlsList(circumference ~ logistic(age, Asym, T50, scal), data = Orange, cluster = ~ Tree) Orange.nlme <- nlme(Orange.lis)