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\name{rigamma}
\alias{rigamma}
\title{Random number generation for inverse gamma distribution}
\description{
Simulates from a inverse gamma (a, b) distribution with density
proportional to $y^(-a-1) exp(-b/y)$
}
\usage{
rigamma(n, a, b)
}
\arguments{
\item{n}{number of random numbers to be generated}
\item{a}{inverse gamma shape parameter}
\item{b}{inverse gamma rate parameter}
}
\value{
vector of n simulated draws
}
\author{Jim Albert}
\examples{
a=10
b=5
n=20
rigamma(n,a,b)
}
\keyword{models}
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