#' Control Chart Constant d4 / D4
#'
#' Calculate D4 control chart constant from Wheeler's SPC books. These are in the same help file
#' because of a quirk of how R generates help file names, but they are different constants with different uses.
#'
#' @param sample.size A scalar or vector of sample sizes
#' @param n.sigma How many standard errors to use (default 3 for most control charts)
#'
#' @return A scalar or vector with computed constants.
spc.constant.calculation.D4 <- function(
sample.size
,n.sigma = 3
) {
sapply(sample.size, FUN = function(i) {
ret <- (1 +
n.sigma *
spc.constant.calculation.d3(i) / spc.constant.calculation.d2(i))
ret
})
}
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