#' Covariate data for three individuals
#'
#' This is a synthetic data for 3 individuals, and the variables are "ID", age" and "gender". It is for
#' illustration purposes of the functions in the package \code{PML} only.
#'
#' @docType data
#'
#' @usage data(pa3)
#'
#' @format An object of class \code{data.frame}.
#'
#' @keywords datasets
#'
#' @examples
#' data(var3)
#'
#' @seealso \code{\link{tre}}
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