\name{centerring}
\docType{data}
\alias{centerring}
\title{Artificial dataset: centerring}
\description{
One spherical cluster surrounded by another ring-shaped cluster. Can be detected by density based cluster algorithms or single link.
}
\usage{data(centerring)}
\format{A dataframe with columns x, y and cluster}
\source{Artificial}
\references{
Oehlschlägel, J. (2006) \emph{Scalable robust clustering with model selection}.
}
\seealso{ \code{\link{spiral}}, \code{\link{SASmodeclus}} }
\keyword{datasets}
