Estimating the optimal number of clusters (NC) is pivotal in cluster analysis. From the viewpoint of sample geometry, a novel internal clustering validity index, which is termed the between-within cluster (BWC) index, is designed in this paper. Moreover, a method is proposed to estimate the optimal NC. The BWC index improves the well-known Silhouette index. BWC validates the clustering results from a certain clustering algorithm (e.g., affinity propagation or hierarchical) and estimates the optimal NC for many kinds of data sets, including synthetic data sets, benchmark data sets, UCI data sets, gene expression data sets, and images. Theoretical analysis and experimental studies demonstrate the effectiveness and high efficiency of the new index and method.
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The authors would like to thank the anonymous reviewers for their insightful comments and valuable suggestions. This work was supported in part by the Fundamental Research Funds for the Central Universities under Grant JUSRP11235 and in part by the National Natural Science Foundation of China under Grant Nos. 61673193 and 61833007.
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Zhou, S., Liu, F. & Song, W. Estimating the Optimal Number of Clusters Via Internal Validity Index. Neural Process Lett (2021). https://doi.org/10.1007/s11063-021-10427-8
- Clustering validity index
- Number of clusters
- Affinity propagation
- Hierarchical clustering