RWeka (version 0.2-0)

Weka_clusterers: R/Weka Clusterers

Description

R interfaces to Weka clustering algorithms.

Usage

Cobweb(x, control = NULL)
FarthestFirst(x, control = NULL)
SimpleKMeans(x, control = NULL)

Arguments

x

an R object with the data to be clustered.

control

a character vector with control options, or NULL (default). Available options can be obtained on-line using the Weka Option Wizard WOW, or the Weka documentation.

Value

• A list inheriting from class Weka_clusterers with components including
• clusterer
  a reference (of class jobjRef) to a Java object obtained by applying the Weka buildClusterer method to the training instances using the given control options.
• class_ids
  a vector of integers indicating the class to which each training instance is allocated (the results of calling the Weka clusterInstance method for the built clusterer and each instance).

Details

There is a predict method for class prediction from the fitted clusterers. Cobweb implements the Cobweb (Fisher, 1987) and Classit (Gennari et al., 1989) clustering algorithms. FarthestFirst implements the farthest first traversal algorithm by Hochbaum and Shmoys, which works as a fast simple approximate clusterer modelled after simple $k$-means.

References

D. H. Fisher (1987). Knowledge acquisition via incremental conceptual clustering. Machine Learning, 2/2, 139--172.

J. Gennari, P. Langley and D. H. Fisher (1989). Models of incremenal concept formation. Artificial Intelligence, 40, 11--62. Hochbaum and Shmoys (1985). A best possible heuristic for the $k$-center problem, Mathematics of Operations Research, 10(2), 180--184.

Examples

data(iris)
cl <- SimpleKMeans(iris[, -5], c("-N", "3"))
cl
table(predict(cl), iris$Species)