Análises Bayesiana para o modelo de regressão Birnbaum-Saunders com zeros ajustados

• Ano de defesa: 2021
• Autor(a) principal: Marcelino, Jadson Luan dos Santos
• Orientador(a): Tomazella, Vera Lucia Damasceno
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Carlos; Câmpus São Carlos
• Programa de Pós-Graduação: Programa Interinstitucional de Pós-Graduação em Estatística - PIPGEs
• Palavras-chave em Português: Birnbaum-Saunders; Reparametrização; Zeros ajustados; Estimação; Análise Bayesiana
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::PROBABILIDADE E ESTATISTICA
• Link de acesso: https://repositorio.ufscar.br/handle/ufscar/14887

Modeling based on the Birnbaum-Saunders distribution has received considerable attention in recent years. In this work we consider the reparametrized Birnbaum-Saunders distribution with zero-adjusted (ZARBS) (SANTOS-NETO et al., 2012). This distribution admits the occurrence of zeros with positive probability, considering a discretecontinuous mixing model that is constructed using a probability mass at zero and a continuous component. ZARBS generalizes at least seven reparametrized Birnbaum- Saunders regression models. In this context, the main contribution of this dissertation is to study ZARBS under a Bayesian approach using the BAMLSS package developed in the R software, as well as to derive influence diagnoses for the model. Diagnostic methods have been important tools in regression analysis to detect anomalies, such as breaking assumptions in the stochastic part of the model, presence of outliers and influential observations. We assess the local influence on parameter estimates considering a perturbation scheme. To verify the potential of the proposed methodology, an application to a set of real data will be considered.