Clustering of variables based on a probabilistic approach defined on the hypersphere.

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Paulo Gomes (Autor) Outra; Adelaide Figueiredo (Autor) FEP

Revista

Título: International Journal of Mathematical, Computational Science and Engineering

Vol. 7 Nº 10

Páginas: 564-566

Editora: World Academy of Science Engineering and Technology

Classificação Científica

FOS: Ciências exactas e naturais > Matemática

Outras Informações

Resumo (PT): Abstract: We consider n individuals described by p standardized variables, represented by points of the surface of the unit hypersphere Sn-1. For a previous choice of n individuals we suppose that the set of observables variables comes from a mixture of bipolar Watson distribution defined on the hypersphere. EM and Dynamic Clusters algorithms are used for identification of such mixture. We obtain estimates of parameters for each Watson component and then a partition of the set of variables into homogeneous groups of variables. Additionally we will present a factor analysis model where unobservable factors are just the maximum likelihood estimators of Watson directional parameters, exactly the first principal component of data matrix associated to each group previously identified. Such alternative model it will yield us to directly interpretable solutions (simple structure), avoiding factors rotations.

Idioma: Inglês

Tipo (Avaliação Docente): Científica