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\name{howardprior}
\alias{howardprior}
\title{Logarithm of Howard's dependent prior for two proportions}
\description{
Computes the logarithm of a dependent prior on two proportions
proposed by Howard in a Statistical Science paper in 1998.
}
\usage{
howardprior(xy,par)
}
\arguments{
\item{xy}{vector of proportions p1 and p2}
\item{par}{vector containing parameter values alpha, beta, gamma, delta, sigma}
}
\value{
value of the log posterior
}
\author{Jim Albert}
\examples{
param=c(1,1,1,1,2)
p=c(.1,.5)
howardprior(p,param)
}
\keyword{models}
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