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stat.ME2026
Spectrally Tuned Bandwidth Selection for Kernel Fuzzy Relational Clustering
Efthymios Costa, John R. J. Thompson
Fuzzy clustering is used to identify overlapping geometric cluster structures through partial memberships. However, classical methods are limited by the assumption of equal variabl…
stat.ME2026
A unified approach to outlier identification for mixed-type data
Efthymios Costa, Christian Hennig
We present an outlier identification method for mixed type data sets comprising continuous and ordinal variables. We define outliers based on using a multivariate Gaussian distribu…
stat.ML2026
Sparse clustering via the Deterministic Information Bottleneck algorithm
Efthymios Costa, Ioanna Papatsouma, Angelos Markos
Cluster analysis relates to the task of assigning objects into groups which ideally present some desirable characteristics. When a cluster structure is confined to a subset of the…