#' Grades obtained from the course of General Biostatistics.
#'
#' @name grades
#' @docType data
#' @author Oscar Ramirez Alan \email{osoramirez@gmail.com}
#' @references Grades obtained from the course of General Biostatistics,courses from Universidad Nacional, Costa Rica.
#' @keywords grades
#' @usage data(grades)
#'
#' @format This data frame contains 47 rows and 2 columns:
#' \itemize{
#' \item{\code{score}} grades by individual.
#' \item{\code{year}} grouped in year.
#' }
#' @keywords datasets
NULL
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