Buscar
Mostrando ítems 1-10 de 1502
Gradient and likelihood ratio tests in cure rate models
(Canadian Center of Science and Education, 2016-06-11)
Modelos série de potência com excesso de zeros observáveis e latentes
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Estatística - PPGEsCâmpus São Carlos, 2016-09-28)
The present work's main objective is to study the significance of zeros in an observable
and latent data. In observable data set that occur excess of zeros, its common to have
sobredispersion. In this sense, the models ...
Separação de espermatozóides x viáveis de sêmen congelado, por gradiente descontínuo de densidade na produção in vitro de embriões destinados a criopreservação
(Universidade Estadual Paulista (Unesp), 2007-07-20)
O presente trabalho teve como objetivos separar os espermatozóides portadores do cromossomo X viáveis, dos portadores do Y, através de gradiente descontínuo de densidade de PercollTM. Utilizar esse sêmen na produção in ...
The local power of the gradient test
(SPRINGER HEIDELBERGHEIDELBERG, 2012)
The asymptotic expansion of the distribution of the gradient test statistic is derived for a composite hypothesis under a sequence of Pitman alternative hypotheses converging to the null hypothesis at rate n(-1/2), n being ...
Local power and size properties of the LR, Wald, score and gradient tests in dispersion models
(ELSEVIER SCIENCE BVAMSTERDAM, 2012)
We derive asymptotic expansions for the nonnull distribution functions of the likelihood ratio, Wald, score and gradient test statistics in the class of dispersion models, under a sequence of Pitman alternatives. The ...
Testes de hipóteses em modelos de sobrevivência com Fração de cura
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Matemática Aplicada e EstatísticaProbabilidade e Estatística; Modelagem Matemática, 2012-08-14)
Survival models deals with the modeling of time to event data. However in some
situations part of the population may be no longer subject to the event. Models
that take this fact into account are called cure rate models. ...
Income gradients in oral health according to child age
(Wiley, 2015)
This study aimed to confirm whether the well-known income disparities in oral health seen over the life course are indeed absent in 9- to 11-yr-old children, and to explore the role of access to dental care in explaining ...
A note on the local power of the LR, Wald, score and gradient tests
(INST MATHEMATICAL STATISTICSCLEVELAND, 2012)
This paper examines the local power of the likelihood ratio, Wald, score and gradient tests under the presence of a scalar parameter, phi say, that is orthogonal to the remaining parameters. We show that some of the ...