#' The 'ctdesign' package.
#'
#' @docType package
#' @name ctdesign-package
#' @aliases ctdesign
#'
#'
#' @import methods
#' @import stats
#' @import ggplot2
#'
#' @importFrom grDevices colors
#' @importFrom graphics axis box legend lines par plot points text arrows grid rect
#' @importFrom parallel detectCores
#' @importFrom utils as.roman
#' @importFrom dplyr %>% group_by_ group_by summarize mutate count mutate_if
#' rename filter select arrange ungroup n distinct left_join if_else rowwise
#' @importFrom tidyr gather
#' @importFrom data.table rbindlist
#'
#' @description Clinical trial design tools
#'
#' @references
#'
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