This project uses the R “Orange” data frame which has 35 rows and 3 columns, of records of the growth of orange trees. The columns are:

1. Tree: a factor indicating the tree on which the measurement was done (including 5 trees).
   
2. age: a numeric value indicating the age of the tree (in days since 31/12/1968).
   
3. circumference: The tree trunk circumference (in mm).

Bellow are the first 10 records of the Orange data set

   Tree  age circumference
1     1  118            30
2     1  484            58
3     1  664            87
4     1 1004           115
5     1 1231           120
6     1 1372           142
7     1 1582           145
8     2  118            33
9     2  484            69
10    2  664           111