#' Calculate NPS
#'
#' @export
#' @param scores Numeric vector of promoter scores
#' @param detractors Scores that are categorized as detractors
#' @param neutrals Scores that are categorized as neutrals
#' @param promoters Scores that are categorized as promoters
#' @examples
#' promoter_scores <- c(1, 8, 8, 10, 5, NA, 9)
#'
#' calc_nps(promoter_scores)
calc_nps <- function(scores, detractors = 0:6, neutrals = 7:8, promoters = 9:10) {
detractors <- sum(scores %in% detractors)
neutrals <- sum(scores %in% neutrals)
promoters <- sum(scores %in% promoters)
total <- detractors + neutrals + promoters
NPS <- (promoters - detractors)/total
NPS*100
}
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