PiscesLogoSmallerStill  Agglomerative cluster analysis

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Hierarchical agglomerative cluster analysis is selected by choosing Clustering: Agglomerative from the drop-down menu. The following methods for linking groups are available:

Ward's

Single linkage

Complete linkage

Average linkage

McQuitty's

Gower's

Centroid

 

Whichever method you select, in the Setup for Cluster box, CAP then offers a choice of 15 distance measures: Euclidean, Geodesic, Whittakers, Ave. Distance, Manhattan, Canberra, Chord, Mean Character Difference (Czekanowski), Bray-Curtis, Squared Chord, Mahalanobis, 1-Jaccard, 1-Sorensen and Square root 1-Sorensen  and Renkonen distance. Each of these distance measures is different, and will influence the outcome of cluster analysis. If you have presence-absence data, it is worthwhile choosing a distance measure specifically designed for it, such as Jaccard's or Sorenson's.

 

Set up dialogue cluster

 

Once a measure has been selected the cluster analysis will immediately be run. Output is presented on a series of tabbed pages. These are described in turn below.

Cluster summary

Cluster groups

Dendrogram - CLUSTER ANALYSIS