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  \item{x}{an \R object.}
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  \item{x}{an \R object.}
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}
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}
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\details{
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\details{
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  This is a special case of ranking, but as a less general function than
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  This is a special case of ranking, but as a less general function than
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  \code{\link{rank}} is more suitable to be made generic.  The default
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  \code{\link{rank}} is more suitable to be made generic.  The default
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  method is similar to \code{rank(x, ties.method="min",
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  method is similar to \code{rank(x, ties.method = "min",
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    na.last="keep")}, so \code{NA} values are given rank \code{NA} and all
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    na.last = "keep")}, so \code{NA} values are given rank \code{NA} and all
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  tied values are given equal integer rank.
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  tied values are given equal integer rank.
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  The \code{\link{factor}} method extracts the codes.  The
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  The \code{\link{factor}} method extracts the codes.  The
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  \code{\link[survival]{Surv}} method sorts first on times and then on
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  \code{\link[survival]{Surv}} method sorts first on times and then on
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  status code(s).
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  status code(s).