#' iris data set
#'
#' @format A data frame with 150 rows and 5 variables:
#' \describe{
#' \item{Sepal.Length}{length of sepal, numerical}
#' \item{Sepal.Width}{width of sepal, numerical}
#' \item{Petal.Length}{length of petal, numerical}
#' \item{Petal.Width}{width of petal, numerical}
#' \item{Species}{name of species, factor}
#' }
#' @aliases iris
#' @docType data
#' @examples
#' data(iris)
"iris"
#' Failthful dataset
#' @format A data frame contains 272 observations and 2 variables
#' \describe{
#' \item{eruptions}{eruptions, numerical}
#' \item{waiting}{waiting, numerical}
#' }
#' @docType data
#' @example
#' data(failthful)
"failthful"
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