#' Identify terminal indicator
#'
#' This is a special function used in the context of recurrent event models
#' with terminal event (e.g., censoring variable related to recurrent events).
#' It contains the status indicator, normally 0=alive, 1=dead, and is used on
#' the right hand side of a formula of a 'frailtyPenal', 'longiPenal' and
#' 'trivPenal' functions. Using \code{terminal()} in a formula implies that a
#' joint frailty model for recurrent events and terminal events is fitted.
#'
#'
#' @usage terminal(x)
#' @param x A numeric variable but should be a Boolean which equals 1 if the
#' subject is dead and 0 if he is alive or censored, as a death indicator.
#' @return \item{x}{a death indicator}
#' @seealso \code{\link{frailtyPenal}}
#' @export
#' @keywords misc
"terminal"<-function(x)
{
x
}
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