Asymmetric Normal Distributions
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Steady-state behavior of nonparametric control charts using sign statistic
Abstract If process is running for a long period in an in-control condition, it will reach in a steady-state condition. In order to study the long term properties of a control chart, it is appropriate to investigate the steady-state average time to signal. In this article, we discussed runs rules representation of a nonparametric synthetic control chart usin
Prod.. Publicado em: 09/10/2015
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2. Construção de distribuições multivariadas com dependências assimétricas : modelos hierárquicos arquimedianos, modelos pair-cópula e cópula t-sudent / Construction of multivariate distributions wits asymmetric dependence : hierarchical arquimedean copula, pair-copula and t-student copula
A construção de distribuições multivariadas com dependências assimétricas, especialmente com dependências complexas nas caudas, é um requisito necessário em muitas aplicações, particularmente em finanças. A teoria de cópulas pode ser bastante útil nesta tarefa. Neste sentido, algumas das propostas sugeridas na literatura são os modelos hierár
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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3. Comparação das distribuições α-estável, normal, t de student e Laplace assimétricas
As distribuições assimétricas tem experimentado grande desenvolvimento nos tempos recentes. Elas são utilizadas na modelagem de dados financeiros, médicos e genéticos entre outras aplicações. Dentre essas distribuições, a normal assimétrica (Azzalini, 1985) tem recebido mais atenção dos pesquisadores (Genton et al., (2001), Gupta et al., (2004)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/01/2012
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4. Modelos de regressão PLS com erros heteroscedásticos
Two problems related to Partial Least Squares method are considered in this work. Heteroscedastic errors and an asymmetrical error distribution. In the _rst part of this work a methodology is developed which allows, based in PLS methods, to estimate the model parameters in the presence of non-constant error variance. This technique is compared with the usual
Publicado em: 2010
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5. Inferência e diagnósticos em modelos assimétricos / Inference and diagnostics in asymmetric models
Este trabalho apresenta um estudo de inferência e diagnósticos em modelos assimétricos. A análise de influência é baseada na metodologia para modelos com dados incompletos, que é relacionada ao algoritmo EM (Zhu e Lee, 2001). Além dos modelos de regressão Normal Assimétrico (Azzalini, 1999) e t-Normal Assimétrico (Gómez, Venegas e Bolfarine, 2007
Publicado em: 2008
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6. Avaliação da acupuntura no tratamento de dores lombares em gestantes
Objectives: To evaluate the effectiveness of acupuncture in the treatment of back pain during the gestational period. Method: A randomized clinical trial was conducted, in which 42 pregnant patients were selected. The age of the patients ranged between 18 years and older and pregnancy ranged from 28 to 35 weeks. All had back pain and scheduled their prenatal
Publicado em: 2005
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7. Sthocastic model for estimating potential maize productivity in Piracicaba-SP, Brazil. / Modelo estocástico para estimação de produtividade potencial de milho em Piracicaba - SP.
With the purpose of proposing a stochastic model for estimating potential maize productivity in Piracicaba (SP), as function of mean values of daily air temperature and solar radiation, a software was developed using Visual Basic for Windows, where it was applied for different agro climatic periods (sowing dates). The results allowed the following conclusion
Publicado em: 2004
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8. Electrophoretic distributions of human peripheral blood mononuclear white cells from normal subjects and from patients with acute lymphocytic leukemia.
The electrophoretic mobilities of mononuclear white cells from the peripheral blood of normal subjects and leukemic patients were measured. Analysis of both fresh and cryopreserved samples of each type showed that cryopreservation had no distinguishable effect on the electrophoretic distribution of either normal or leukemic cells. Mode mobilities (mobilities
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9. Distributions of molecular forms of acetylcholinesterase and butyrylcholinesterase in nervous tissue of the cat.
We analyzed the activities of acetylcholinesterase and butyrylcholinesterase, and of the metabolic enzymes enolase and lactate dehydrogenase, in the superior cervical ganglion, ciliary ganglion, dorsal root ganglion, stellate ganglion, and caudate nucleus of the cat; we found that these tissues possess very different levels of enzymic activities. The proport
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10. Properties of single fast chloride channels from rat cerebral cortex neurons.
1. Properties of Cl- channels from surface membranes of acutely dissociated rat cerebral cortical neurons were studied with the patch clamp technique. These channels were present in the majority of excised inside-out membrane patches. 2. Cl- channels were rarely observed in cell-attached membrane patches, and usually several minutes elapsed following excisio