Java: Data Science Made Easy

Cluster analysis

Clustering, or cluster analysis, is another family of unsupervised learning algorithms. The goal of clustering is to organize data into clusters such that the similar items end up in the same cluster, and dissimilar items in different ones.

There are many different algorithm families for performing clustering, and they differ in how they group elements.

The most common families are as follows:

• Hierarchical: This organizes the dataset into a hierarchy, for example, agglomerative and divisive clustering. The result is typically a dendrogram.
• Partitioning: This splits the dataset into K disjoint classes--K is often specified in advance--for example, K-means.
• Density-based: This organizes the items based on density regions; ...