# Orange trees

Filed under:
Growth models

Simple growth curve example with individual effects (random effects) from Pinheiro & Bates (2000)

A growth curve model fitted to the "orange tree" data by Pinheiro & Bates (2000, Ch.8.2)
as an illustration of the R (S-Plus) routine nlme(). The logistic growth curve is given as

*y*= f

_{1}/(1 + exp[-(

*t*-f

_{2})/f

_{3}]) ] + e,

where

*y*is the response and*t*is the age of the tree. The regression parameters to be estimated are: f_{1}, f_{2}and f_{3}, and e is the residual error term. A random effect*u*is added to the parameter f_{1}.

### Details

orange.pdf### Extension of the model

See subfolders to the left

### Files

See list to the left