#' Calculate Standard Error From A Vector
#'
#' @param x A single number or vector of numbers
#' @return Returns the standard error of x. Automatically removes NA.
#' @export
#' @examples
#'
#' se(c(5,10,12,13))
#'
se <- function(x){
sd(x, na.rm=TRUE)/sqrt(!is.na(length(x)))
}
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