Valença, Dione MariaSantos, Patrícia Borchardt2014-12-172010-07-122014-12-172009-12-01SANTOS, Patrícia Borchardt. Estimação em modelos de tempo de falha acelerado para dados de sobrevivência correlacionados. 2009. 65 f. Dissertação (Mestrado em Probabilidade e Estatística; Modelagem Matemática) - Universidade Federal do Rio Grande do Norte, Natal, 2009.https://repositorio.ufrn.br/jspui/handle/123456789/17007We presented in this work two methods of estimation for accelerated failure time models with random e_ects to process grouped survival data. The _rst method, which is implemented in software SAS, by NLMIXED procedure, uses an adapted Gauss-Hermite quadrature to determine marginalized likelihood. The second method, implemented in the free software R, is based on the method of penalized likelihood to estimate the parameters of the model. In the _rst case we describe the main theoretical aspects and, in the second, we briey presented the approach adopted with a simulation study to investigate the performance of the method. We realized implement the models using actual data on the time of operation of oil wells from the Potiguar Basin (RN / CE).application/pdfAcesso AbertoModelos de tempo de falha aceleradoDados correlacionadosPetróleoAccelerated failure time modelsGrouped dataOilmasterThesisCNPQ::CIENCIAS EXATAS E DA TERRA::PROBABILIDADE E ESTATISTICA