NMath Reference Guide

## LinkageMedianLinkage Method |

Computes the distance between two clusters as the difference between centroids,
using the size of each cluster as a weighting factor.

Syntax

public static double MedianLinkage( double Drp, double Drq, double Dpq, double Nr, double Np, double Nq )

- Drp
- Type: SystemDouble

The distance between R and P. - Drq
- Type: SystemDouble

The distance between R and Q. - Dpq
- Type: SystemDouble

The distance between P and Q. - Nr
- Type: SystemDouble

The number of objects in R. - Np
- Type: SystemDouble

The number of objects in P. - Nq
- Type: SystemDouble

The number of objects in Q.

The distance between R and P + Q.

Remarks

During cluster analysis when two groups P and Q are united, a linkage function
computes the distance between the new group P + Q and another group R.

This is sometimes referred to as "weighted pair-group method using the centroid average," and abbreviated WPGMC.

This is sometimes referred to as "weighted pair-group method using the centroid average," and abbreviated WPGMC.

See Also