The Broken-Ring Data Set

Description

The broken-ring data set studied in Wang et al. (2007).

Usage

data(Ring)

Value

A list contains a 800 by 2 data matrix and a 800 by 1 cluster membership vector. There are 5 clusters containing 200, 157, 151, 151 and 141 data points, respectively, in a two-dimensional space.

References

Wang, S., Qiu, W., and Zamar, R. H. (2007). CLUES: A non-parametric clustering method based on local shrinking. Computational Statistics & Data Analysis, Vol. 52, issue 1, pages 286-298.

Examples

    data(Ring)
 
    # data matrix
    ring <- Ring$ring
 
    # 'true' cluster membership
    ring.mem <- Ring$ring.mem

    # 'true' number of clusters
    nClust <- length(unique(ring.mem))

    # scatter plots
    plotClusters(ring, ring.mem)