#' Control Chart Constant c4
#'
#' Calculate c4 control chart constant from Wheeler's SPC books.
#'
#' @param sample.size A scalar or vector of sample sizes
#'
#' @return A scalar or vector with computed constants.
spc.constant.calculation.c4 <- function(
sample.size
) {
sapply(sample.size, FUN = function(i) {
spc.constant.calculation.c2(i) * sqrt(i/(i-1))
})
}
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