Comparative Analysis of L¹ Norm Variants for Convex Clustering in Compositional Data
M. Comas Cufí, P. De La Lama, J. Saperas Riera
Significant advancements in compositional data (CoDa) analysis using Aitchison geometry enable robust metric space exploration. CoDa resides in the Simplex, a (D-1)-dimensional space. This study compares various norms, focusing on the L1-norm, and applies convex clustering algorithms adapted to CoDa. We evaluate different L1-based penalization terms: the L1-olr norms (derived from Principal Components and a Sequential Binary Partition -default in CoDaPack-), the L1-clr norm, and the L1-CoDa norm, using a dataset on milk composition from 24 mammals. Results show that L1-olr lacks subcompositional coherence and basis independence but is suitable for agglomerative clustering, whereas L1-clr preserves those properties but is less effective for agglomerative clustering. The L1-CoDa norm maintains the compositional properties and supports agglomeration, enhancing meaningful data interpretation. These findings highlight the importance of tailored norms for CoDa clustering.
Palabras clave: compositional data, L¹-Norm, clustering
Programado
Sesión de pósters I
12 de junio de 2025 19:00
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