@subsubheading Format

@table @code
@item weight
a numeric vector giving the body weight of the chick (gm).
@item Time
a numeric vector giving the number of days since birth when the
measurement was made.
@item Chick
an ordered factor with levels 18 < ... < 48 giving a unique
identifier for the chick. The ordering of the levels groups chicks on the same
diet together and orders them according to their final weight (lightest to
heaviest) within diet.
@item Diet
a factor with levels 1, ..., 4 indicating which experimental diet
the chick received.
@end table

@subsubheading Source

Crowder, M. and Hand, D. (1990). @cite{Analysis of Repeated Measures}. London: Chapman and
Hall. (example 5.3)

Hand, D. and Crowder, M. (1996), @cite{Practical Longitudinal Data Analysis}. London: Chapman
and Hall. (table A.2)

Pinheiro, J. C. and Bates, D. M. (2000) @cite{Mixed-effects Models in S and S-PLUS}.
New York: Springer.

@subsubheading Examples

@example
@INCLUDE_DATASET_EXAMPLE_SCRIPT{ChickWeight_1.m}
@end example
