Cluster Analysis. Cluster Analysis. What is Cluster Analysis? Types of Data in Cluster Analysis A Categorization of Major Clustering Methods Partitioning Methods Hierarchical Methods Density-Based Methods Grid-Based Methods Model-Based Clustering Methods. Model based clustering.
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Given the models, estimate the probability of a given record to belong to cluster h at iteration j as follows:
Then, re-compute the models:
- Use only the data
For 2, 3, and 4, we can further distinguish whether we want to evaluate the entire clustering or just individual clusters.
Corr = 0.9235
Corr = 0.5810
SSE of clusters found using K-means
“The validation of clustering structures is the most difficult and frustrating part of cluster analysis.
Without a strong effort in this direction, cluster analysis will remain a black art accessible only to those true believers who have experience and great courage.”
Algorithms for Clustering Data, Jain and Dubes