#' Control Chart Constant A1
#'
#' Calculate A1 control chart constant from Wheeler's SPC books.
#'
#' @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.A1 <- function(
sample.size,
n.sigma = 3
) {
sapply(sample.size, FUN = function(i) {
n.sigma/(spc.constant.calculation.c2(i) * sqrt(i))
})
}
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