[R] grouping data

[adolfpf]

All the examples in 'nlme' are in "Grouped Data: distance ~ age | Subject"
format.

How do I "group" my data in "dolf" the same way the data "Orthodont" are
grouped.

> show(dolf)
   distance   age Subjectt Sex
1    6.83679 22.01       F1   F
2    6.63245 23.04       F1   F
3   11.58730 39.26       M2   M


> show(Orthodont)
Grouped Data: distance ~ age | Subject
   distance age Subject    Sex
1       26.0   8     M01   Male
2       25.0  10     M01   Male
3       29.0  12     M01   Male


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