Soft subspace clustering of interval-valued data with regularizations

• Published in: Knowledge-based systems Vol. 227; p. 107191
• Main Authors: Rodríguez, Sara I.R., de Carvalho, Francisco de A.T.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 05.09.2021; Elsevier Science Ltd
• Subjects: Adaptive distances; Algorithms; Clustering; Data analysis; Fuzzy clustering; Histograms; Interval-valued data analysis; Regularization clustering; Regularization clustering; Interval-valued data analysis; Fuzzy clustering; Adaptive distances
• ISSN: 0950-7051; 1872-7409
• DOI: 10.1016/j.knosys.2021.107191

Data analysis plays an indispensable role in understanding different phenomena. One of the vital means of handling these data is to group them into a set of clusters given a measure of similarity. Usually, clustering methods deal with objects described by single-valued variables. Nevertheless, this representation is too restrictive for representing complex data, such as lists, histograms, or even intervals. Furthermore, in some problems, many dimensions are irrelevant and can mask existing clusters. In this regard, new interval-valued data clustering methods with regularizations and adaptive distances are proposed. These approaches consider that the boundaries of the interval-valued variables have the same and different importance for the clustering process. The algorithms optimize an objective function alternating three steps for obtaining the representatives of each group, a fuzzy partition, and the relevance weights of the variables. Experiments on synthetic and real data sets corroborate the robustness and usefulness of the proposed methods.