3. Electronic Theses and Dissertations (ETDs) - All submissions

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Evaluation of cluster analysis and latent class analysis in clustering
(2019) Murisa, Tatenda
The study compares the performance of latent class, K-means and hierarchical clustering on data with diﬀerent degrees of cluster overlap. It also assesses how various standardisation methods aﬀect the results of hierarchical and K-means clustering. Several distance and agglomeration methods are evaluated to observe how they perform depending on cluster overlap. Three artiﬁcial datasets were simulated whose clusters were poorly, moderately and well separated. These along with the seeds data were run through the three clustering methods. Several external validity indices were calculated for each cluster solution. The adjusted Rand index was used for comparison in the discussion because it is not aﬀected by the number of clusters. Results showed that Ward’s method performed better compared to all other agglomeration methods and the Manhattan distance performed better across the diﬀerent cluster types in hierarchical clustering. Latent class clustering performed better for poorly and well separated clusters. When the variance of the variables were comparable, K-means clustering with no standardisation performed well. Standardisation by the maximum value and z-score had the best cluster recovery when the variance of variables were large.