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  \emph{Echinochloa crus-galli}.
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  \emph{Echinochloa crus-galli}.
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}
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}
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\usage{CO2}
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\usage{CO2}
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\format{
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\format{
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  An object of class
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  An object of class
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  \code{c("nfnGroupedData", "nfGroupedData", "groupedData", "data.frame")}
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  \code{c("nfnGroupedData", "nfGroupedData", "groupedData", "data.frame")}
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  containing the following columns:
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  containing the following columns:
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  \describe{
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  \describe{
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    \item{Plant}{
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    \item{Plant}{
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      an ordered factor with levels
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      an ordered factor with levels
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      \code{Qn1} < \code{Qn2} < \code{Qn3} < \dots < \code{Mc1}
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      \code{Qn1} < \code{Qn2} < \code{Qn3} < \dots < \code{Mc1}
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      giving a unique identifier for each plant.
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      giving a unique identifier for each plant.
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    }
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    }
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    \item{Type}{
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    \item{Type}{
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      a factor with levels
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      a factor with levels
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      \code{Quebec}
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      \code{Quebec}
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      \code{Mississippi}
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      \code{Mississippi}
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      giving the origin of the plant
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      giving the origin of the plant
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    }
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    }
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    \item{Treatment}{
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    \item{Treatment}{
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      a factor with levels
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      a factor with levels
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      \code{nonchilled}
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      \code{nonchilled}
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      \code{chilled}
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      \code{chilled}
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    }
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    }
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    \item{conc}{
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    \item{conc}{
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      a numeric vector of ambient carbon dioxide concentrations (mL/L).
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      a numeric vector of ambient carbon dioxide concentrations (mL/L).
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    }
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    }
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\details{
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\details{
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  The \eqn{CO_2}{CO2} uptake of six plants from Quebec and six plants
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  The \eqn{CO_2}{CO2} uptake of six plants from Quebec and six plants
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  from Mississippi was measured at several levels of ambient
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  from Mississippi was measured at several levels of ambient
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  \eqn{CO_2}{CO2} concentration.  Half the plants of each type were
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  \eqn{CO_2}{CO2} concentration.  Half the plants of each type were
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  chilled overnight before the experiment was conducted.
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  chilled overnight before the experiment was conducted.
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  This dataset was originally part of package \code{nlme}, and that has
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  This dataset was originally part of package \code{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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  Potvin, C., Lechowicz, M. J. and Tardif, S. (1990)
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  Potvin, C., Lechowicz, M. J. and Tardif, S. (1990)
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  \dQuote{The statistical analysis of ecophysiological response curves
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  \dQuote{The statistical analysis of ecophysiological response curves
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  obtained from experiments involving repeated measures}, \emph{Ecology},
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  obtained from experiments involving repeated measures}, \emph{Ecology},