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#' Counts how many values are NA
#'
#' Returns the number of values that are NA
#'
#' @param x object to count how many values are `NA`
#'
#' @details
#'
#' `n_na` counts the number of missing values. `na.n` is an alias in the dplyr
#' style.
#'
#' `pct_na` gives the percentage of values that are `NA`
#'
#' @return
#'
#' `n_na` returns an integer. `pct_na` returns a numeric value 0-1.
#'
#' @examples
#' x <- c( 1, NA, NA, 4:5 )
#' n_na(x)
#' pct_na(x)
#'
#' @export
n_na <- function(x)
sum( is.na(x) )
#' @rdname n_na
#' @export
na.howmany <- n_na
#' @rdname n_na
#' @export
na.n <- n_na
#' @rdname n_na
#' @export
pct_na <- function(x)
n_na(x) / length(x)
#' @rdname n_na
#' @export
na.pct <- pct_na
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