#' Fictional data set counting emergency department visits
#'
#' A dataset containing number of visits to teh emergency department for each of
#' 20 students during the school year.
#'
#' @format A data frame with 20 rows and 2 variables:
#' \describe{
#' \item{id}{Student study identification number}
#' \item{er}{Number of emergency department visits in the previous academic
#' year}
#' }
"students"
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