| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] Univ Sao Paulo, Inst Phys, Av Trabalhador Sao Carlense 400, Sao Paulo, SP - Brazil
[2] Univ Fed Sao Carlos, Comp Sci Dept, Rod Washington Luis, Km 235, Sao Carlos, SP - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS; v. 585, JAN 1 2022. |
| Web of Science Citations: | 0 |
| Abstract | |
Hierarchical agglomerative methods stand out as particularly effective and popular approaches for clustering data. Yet, these methods have not been systematically compared regarding the important issue of false positives while searching for clusters. A model of clusters involving a higher density nucleus surrounded by a transition, followed by outliers is adopted as a means to quantify the relevance of the obtained clusters and address the problem of false positives. Six traditional methodologies, namely the single, average, median, complete, centroid and Ward's linkage criteria are compared with respect to the adopted model. Unimodal and bimodal datasets obeying uniform, gaussian, exponential and power-law distributions are considered for this comparison. The obtained results include the verification that many methods detect two clusters in unimodal data. The single-linkage method was found to be more resilient to false positives. Also, several methods detected clusters not corresponding directly to the nucleus. (C) 2021 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 19/01077-3 - Integrating computer vision and complex networks for urban analysis |
| Grantee: | Eric Keiji Tokuda |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 15/22308-2 - Intermediate representations in Computational Science for knowledge discovery |
| Grantee: | Roberto Marcondes Cesar Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/09125-4 - Representation, characterization and modeling of biological images using complex networks |
| Grantee: | Cesar Henrique Comin |
| Support Opportunities: | Regular Research Grants |