The R Project SVN R

\name{Logistic}
\title{The Logistic Distribution}
\usage{
dlogis(x, location, scale=1)
plogis(q, location, scale=1)
qlogis(p, location, scale=1)
rlogis(n, location, scale=1)
}
\alias{dlogis}
\alias{plogis}
\alias{qlogis}
\alias{rlogis}
\description{
  These functions provide information about the logistic distribution
  with parameters \code{location} and \code{scale}.  \code{dlogis} gives
  the density, \code{plogis} gives the distribution function
  \code{qlogis} gives the quantile function and \code{rlogis} generates
  random deviates.

  The Logistic distribution with \code{location} \eqn{a} and
  \code{scale} \eqn{b} has density
  \deqn{
    f(x) =
    \frac{1}{b} \frac{e^{(x-a)/b}}{(1 + e^{(x-a)/b})^2}}{
    f(x) =
    1/b exp((x-a)/b) (1 + exp((x-a)/b))^-2.}
}
\examples{
x <- 0:4
paste(dlogis(x, loc = 0)) == paste(exp(x) * (1 + exp(x))^-2)
}
\keyword{distribution}