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#' Efficient Points Scored (EPS)
#'
#' @aliases do_EPS
#'
#' @description
#' A limitation of \code{\link{do_OE}} is that it doesn't rely on the quantity
#' of the player's offense production, that's to say, whether the player
#' provides a lot of offense or not. In addition, it does not give credit
#' for free-throws. An extension of \code{\link{do_OE}} has been defined:
#' the Efficient Points Scored (EPS), which is the result of the product of
#' OE and points scored. Points scored counts free-throws, two-point and
#' three-point field goals. A factor \emph{F} is also added to put the adjusted
#' total points on a points scored scale. With the factor \emph{F}, the sum of the
#' EPS scores for all players in a given season is equal to the sum of the
#' league total points scored in that season.
#'
#' @usage
#' do_EPS(df)
#'
#' @param df Data frame with the games and the players info.
#'
#' @return
#' EPS values.
#'
#' @references
#' Shea, S., Baker, C., (2013). Basketball Analytics:
#' Objective and Efficient Strategies for Understanding
#' How Teams Win. Lake St. Louis, MO: Advanced Metrics, LLC.
#'
#' @author
#' Guillermo Vinue
#'
#' @seealso
#' \code{\link{do_OE}}, \code{\link{do_add_adv_stats}}
#'
#' @examples
#' df <- do_join_games_bio("ACB", acb_games_1718, acb_players_1718)
#' df1 <- do_add_adv_stats(df)
#' do_EPS(df1)[1]
#'
#' @export
do_EPS <- function(df){
oe_num <- do_OE(df)
den <- oe_num * df$PTS
F <- sum(df$PTS) / sum(den)
eps_num <- round(F * den, 1)
return(eps_num)
}
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