Publications

Publications by Adelaide Figueiredo

2013

Classificação de variáveis definidas na hiperesfera através de um modelo de mistura.

Authors
Adelaide Figueiredo; Paulo Gomes;

Publication

Abstract

2015

Monitoring the covariance matrix of a multivariate skew normal distribution

Authors
Adelaide Figueiredo; Fernanda Figueiredo;

Publication

Abstract

2018

Métodos Fatoriais de Análise de Dados e Big Data

Authors
Adelaide Figueiredo; Fernanda Figueiredo;

Publication

Abstract

2017

Inferência Estatística - Problemas resolvidos e propostos com aplicações em R

Authors
Fernanda Figueiredo; Adelaide Figueiredo; Alexandra Ramos; Paulo Teles;

Publication

Abstract

2025

Clustering and Classification of Compositional Data Using Distributions Defined on the Hypersphere

Authors
Figueiredo, A;

Publication
Springer Proceedings in Mathematics and Statistics

Abstract
We propose an approach to cluster and classify compositional data. We transform the compositional data into directional data using the square root transformation. To cluster the compositional data, we apply the identification of a mixture of Watson distributions on the hypersphere and to classify the compositional data into predefined groups, we apply Bayes rules based on the Watson distribution to the directional data. We then compare our clustering results with those obtained in hierarchical clustering and in the K-means clustering using the log-ratio transformations of the data and compare our classification results with those obtained in linear discriminant analysis using log-ratio transformations of the data. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

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2016

Aplicação do coeficiente RV em Controlo Estatístico da Qualidade

Authors
Adelaide Figueiredo; Fernanda Figueiredo;

Publication

Abstract