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\name{xtfrm}
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\name{xtfrm}
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\alias{xtfrm}
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\alias{xtfrm}
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\alias{xtfrm.default}
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\alias{xtfrm.default}
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\alias{xtfrm.factor}
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\alias{xtfrm.factor}
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\alias{xtfrm.AsIs}
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\alias{xtfrm.AsIs}
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%% Moved to package survival.
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\alias{xtfrm.Surv}
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%% \alias{xtfrm.Surv}
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\alias{xtfrm.Date}
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\alias{xtfrm.Date}
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\alias{xtfrm.POSIXct}
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\alias{xtfrm.POSIXct}
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\alias{xtfrm.POSIXlt}
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\alias{xtfrm.POSIXlt}
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\alias{xtfrm.difftime}
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\alias{xtfrm.difftime}
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\title{Auxiliary Function for Sorting and Ranking}
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\title{Auxiliary Function for Sorting and Ranking}
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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.
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  \code{\link[survival]{Surv}} method sorts first on times and then on
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  %% The \code{\link[survival]{Surv}} method sorts first on times and
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  status code(s), finally on \code{timme2} if present.  Note that with
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  %% then on status code(s), finally on \code{timme2} if present.  Note
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  the conventional status codes this sorts individuals still alive before
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  %% that with the conventional status codes this sorts individuals
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  deaths.
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  %% still alive before deaths.
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  The default method will unclass the object if
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  The default method will unclass the object if
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  \code{\link{is.numeric}(x)} is true but otherwise make use of
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  \code{\link{is.numeric}(x)} is true but otherwise make use of
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  \code{==} and \code{>} methods for the class of \code{x[i]} (for
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  \code{==} and \code{>} methods for the class of \code{x[i]} (for
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  integers \code{i}), and the \code{is.na} method for the class of
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  integers \code{i}), and the \code{is.na} method for the class of