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#' @name rmst2.sample.data
#' @aliases rmst2.sample.data
#' @title Generate a sample data from the pbc data
#' @description This is a function to retrieve 312 randomized patients from the pbc data.
#' @usage rmst2.sample.data(t.unit="year")
#' @param t.unit Specify the time unit. It supports "year" (default), "month", and "day".
#' @details The function creates a sample dataset to illustrate the usage of the function \code{rmst2()} in this package.
#' The original pbc data in \code{survival} package consists of 418 patients data.
#' This function loads the pbc data, select the 312 patients who were randomized.
#' The status variable is edited, so that 1 indicates death and 0 indicates alive.
#' @return returns a data frame
#' @seealso \code{pbc} in survival package
#' @examples
#' D=rmst2.sample.data()
#' head(D)
#' @export
#######################################
# rmst2 sample data
######################################
rmst2.sample.data=function(t.unit="year"){
data("pbc", envir = environment()) ;
tmp <- get("pbc", envir = environment()) ;
D=tmp[1:312,c(2:5,10,11,13,19)]
if(t.unit=="year"){
D$time=D$time/365.25
}
if(t.unit=="month"){
D$time=D$time/365.25*12
}
if(t.unit=="day"){
D$time=D$time
}
D$status=as.numeric(D$status==2);
D$arm=as.numeric(D$trt==1) ;
DA=D[,c(1, 2, 9, 4:8)]
DA
}
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