#' Density, cumulative density, quantiles and random number generation for the
#' generalized Pareto distribution
#'
#' Density, cumulative density, quantiles and random number generation for the
#' generalized Pareto distribution
#'
#' Random number generation is done by transformation of a standard
#' exponential.
#'
#' @param x,q,p Value, quantile or probability respectively.
#' @param n Number of random numbers to simulate.
#' @param sigma Scale parameter.
#' @param xi Shape parameter.
#' @param u Threshold
#' @param log.d,log.p Whether or not to work on the log scale.
#' @param lower.tail Whether to return the lower tail.
#' @author Janet E Heffernan, Paul Metcalfe, Harry Southworth
#' @keywords models
#' @examples
#'
#' x <- rgpd(1000, sigma=1, xi=.5)
#' hist(x)
#' x <- rgpd(1000, sigma=exp(rnorm(1000, 1, .25)), xi=rnorm(1000, .5, .2))
#' hist(x)
#' plot(pgpd(x, sigma=1, xi=.5))
#'
#' @export dgpd
dgpd <- function(x, sigma, xi, u = 0, log.d=FALSE ) {
.dgpd(x, sigma, xi, u, log.d)
}
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