#' PPV
#'
#' @param sens
#' @param spec
#' @param prev
#'
#' @return
#' @export
#'
#' @examples
PPV <- function(sens,
spec,
prev) {
(sens*prev)/(sens*prev + (1 - spec)*(1 - prev))
}
#' NPV
#'
#' @param sens
#' @param spec
#' @param prev
#'
#' @return
#' @export
#'
#' @examples
NPV <- function(sens,
spec,
prev) {
(spec*(1 - prev))/((1 - sens)*prev + spec*(1 - prev))
}
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