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\name{qkulczynski}
\alias{qkulczynski}
%- Also NEED an `\alias' for EACH other topic documented here.
\title{Quantitative Kulczynski distance matrix}
\description{
Computes quantitative Kulczynski distances between the columns of an
abundance matrix.
}
\usage{
qkulczynski(regmat, log.distance=FALSE)
}
%- maybe also `usage' for other objects documented here.
\arguments{
\item{regmat}{(non-negative) abundance matrix. Columns are species,
rows are regions.}
\item{log.distance}{logical. If \code{TRUE}, 1 is added to the
abundance matrix and then the logs of the values are taken in order
to compute the distance.}
}
\details{
The quantitative Kulczynski distance between two species
is 1-(mean of (mean of over regions minimum abundance of both
species)/(sum of abundances of species 1) and (mean of over regions
minimum abundance of both species)/(sum of abundances of species 2)).
If the abundance matrix is a 0-1-matrix, this gives the standard
Kulczynski distance.
}
\value{
A symmetrical matrix of quantitative Kulczynski distances.
}
\references{
D. P. Faith, P. R. Minchin and L. Belbin (1987) Compositional
dissimilarity as a robust measure of ecological distance.
\emph{Vegetation} 69, 57-68.
}
\author{Christian Hennig
\email{christian.hennig@unibo.it}
\url{https://www.unibo.it/sitoweb/christian.hennig/en}}
\seealso{
\code{\link{kulczynski}}
}
\examples{
options(digits=4)
data(kykladspecreg)
qkulczynski(t(kykladspecreg))
}
\keyword{cluster}% at least one, from doc/KEYWORDS
\keyword{spatial}% __ONLY ONE__ keyword per line
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