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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{ChickWeight}
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\name{ChickWeight}
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\docType{data}
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\docType{data}
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\alias{ChickWeight}
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\alias{ChickWeight}
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\title{Weight versus age of chicks on different diets}
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\title{Weight Versus Age of Chicks on Different Diets}
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\description{
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\description{
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  The \code{ChickWeight} data frame has 578 rows and 4 columns from an
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  The \code{ChickWeight} data frame has 578 rows and 4 columns from an
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  experiment on the effect of diet on early growth of chicks.
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  experiment on the effect of diet on early growth of chicks.
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}
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}
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\usage{ChickWeight}
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\usage{ChickWeight}
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      a numeric vector giving the number of days since birth when
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      a numeric vector giving the number of days since birth when
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      the measurement was made.
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      the measurement was made.
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    }
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    }
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    \item{\code{Chick}}{
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    \item{\code{Chick}}{
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      an ordered factor with levels
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      an ordered factor with levels
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      \code{18} < \dots < \code{48}
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      \samp{18} < \dots < \samp{48}
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      giving a unique identifier for the chick.  The ordering of
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      giving a unique identifier for the chick.  The ordering of
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      the levels groups chicks on the same diet together and
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      the levels groups chicks on the same diet together and
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      orders them according to their final weight (lightest to
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      orders them according to their final weight (lightest to
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      heaviest) within diet.
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      heaviest) within diet.
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    }
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    }
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    \item{\code{Diet}}{
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    \item{\code{Diet}}{
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      a factor with levels 1, \dots, 4 indicating which
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      a factor with levels \samp{1}, \dots, \samp{4} indicating which
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      experimental diet the chick received.
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      experimental diet the chick received.
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    }
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    }
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  }
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  }
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}
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}
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\details{
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\details{
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  The body weights of the chicks were measured at birth and every
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  The body weights of the chicks were measured at birth and every
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  second day thereafter until day 20.  They were also measured on day
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  second day thereafter until day 20.  They were also measured on day
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  21.  There were four groups on chicks on different protein diets.
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  21.  There were four groups of chicks on different protein diets.
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  This dataset was originally part of package \CRANpkg{nlme}, and that has
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  This dataset was originally part of package \CRANpkg{nlme}, and that has
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  methods (including for \code{[}, \code{as.data.frame}, \code{plot} and
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  methods (including for \code{[}, \code{as.data.frame}, \code{plot} and
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  \code{print}) for its grouped-data classes.
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  \code{print}) for its grouped-data classes.
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}
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}
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\source{
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\source{
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  \bibinfo{R:Crowder+Hand:1990}{note}{Example 5.3}
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  \bibinfo{R:Crowder+Hand:1990}{note}{Example 5.3, pages 74--78}
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  \bibinfo{R:Hand+Crowder:1996}{note}{Table A.2}
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  \bibinfo{R:Hand+Crowder:1996}{note}{Table A.2, page 172}
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  \bibshow{R:Crowder+Hand:1990,
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  \bibshow{R:Crowder+Hand:1990,
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    R:Hand+Crowder:1996,
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    R:Hand+Crowder:1996,
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    R:Pinheiro+Bates:2000}
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    R:Pinheiro+Bates:2000}
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}
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}
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\seealso{
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\seealso{