#' Acute Leukemia data from Freireich et al (1963).
#'
#' In this study there were 21 pairs of subjects, and within each
#' pair one subject received 6-mercaptopurine (6-MP) and one got
#' placebo. The data are right censored.
#'
#' See also Gehan (1965) who used the data ignoring the pairing so
#' that he could illustrate his famous two-sample (non-paired) rank
#' test.
#'
#' @format A data frame with 42 observations on the following variables.
#' \describe{
#' \item{\code{time}}{time in remission (in weeks)}
#' \item{\code{status}}{event status, 1 is relapse, 0 is censored}
#' \item{\code{treatment}}{treatment group: either 'placebo' or '6-MP'}
#' \item{\code{pair}}{pair id number}
#' }
#' @source bpcp package
#' @references
#' Gehan (1965) Biometrika 52:203-223.
#' Freireich et al (1963) Blood 21(6):699-716.
#' @examples
#' head(frei)
"frei"
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