de.lmu.ifi.dbs.elki.algorithm.clustering.hierarchical

Class MedianLinkageMethod

java.lang.Object

de.lmu.ifi.dbs.elki.algorithm.clustering.hierarchical.MedianLinkageMethod

All Implemented Interfaces:

LinkageMethod

@Reference(authors="J. C. Gower",
           title="A comparison of some methods of cluster analysis",
           booktitle="Biometrics (1967)",
           url="http://www.jstor.org/stable/10.2307/2528417")
@Alias(value={"wpgmc","WPGMC","weighted-centroid"})
public class MedianLinkageMethod
extends Object
implements LinkageMethod

Median-linkage clustering method: Weighted pair group method using centroids (WPGMC). Reference:

J.C. Gower
A comparison of some methods of cluster analysis
Biometrics (1967): 623-637.

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MedianLinkageMethod.Parameterizer Class parameterizer.

Field Summary

Fields

Modifier and Type	Field and Description
static MedianLinkageMethod	STATIC Static instance of class.

Constructor Summary

Constructors

Constructor and Description
MedianLinkageMethod() Deprecated. use the static instance STATIC instead.

Method Summary

Methods

Modifier and Type	Method and Description
double	combine(int sizex, double dx, int sizey, double dy, int sizej, double dxy) Compute combined linkage for two clusters.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

STATIC

public static final MedianLinkageMethod STATIC

Static instance of class.

Constructor Detail

MedianLinkageMethod

@Deprecated
public MedianLinkageMethod()

Deprecated. use the static instance STATIC instead.

Constructor.

Method Detail

combine

public double combine(int sizex,
             double dx,
             int sizey,
             double dy,
             int sizej,
             double dxy)

Description copied from interface: LinkageMethod

Compute combined linkage for two clusters.

Specified by:

combine in interface LinkageMethod

Parameters:

sizex - Size of first cluster x before merging

dx - Distance of cluster x to j before merging

sizey - Size of second cluster y before merging

dy - Distance of cluster y to j before merging

sizej - Size of candidate cluster j

dxy - Distance between clusters x and y before merging

Returns:

Combined distance