#' Return standard deviation of an input vector/list.
#'
#' @param x vector/list of numeric
#'
#' @return numeric
#' @export
#'
#' @examples
#' standard_deviation(c(1,2,3,4))
standard_deviation <- function(x) {
n <- length(x)
mean = sum(x) / n
sum_x = sum(x)
mean = sum_x / n
ssq <- sum((x-mean)^2)
stddev = sqrt(ssq/n)
return(stddev)
}
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