Bayesian Criteria
Mostrando 25-36 de 40 artigos, teses e dissertações.
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25. Phylogeny of Lamiales, with emphasis on Gratiolaceae species to Brazil / Filogenia molecular de Lamiales, com ênfase em espécies nativas de Gratiolaceae
The history of Scrophulariaceae has been characterized by different treatments regarding the circumscription of the family. Some proposals have included in the family groups currently recognized as belonging to families such as Globulariaceae, Lentibulariaceae, Orobanchaceae, Plantaginaceae e Selaginaceae. Tribe Gratioleae, traditionally included in Scrophul
Publicado em: 2009
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26. Variance component estimates applying random regression models for test-day milk yield in Caracu heifers (Bos taurus Artiodactyla, Bovidae)
Random regression models (RRM) were used to estimate covariance functions for 2,155 first-lactation milk yields of native Brazilian Caracu heifers. The models included contemporary group (defined as year-month of test and paddock) fixed effects, and quadratic effect of age of cow at calving. Genetic and permanent environmental effects were fitted by a random
Genetics and Molecular Biology. Publicado em: 2008
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27. Estimação de contrastes de médias de tratamentos, de um experimento em blocos ao acaso, utilizando as análises clássica e espacial / Estimation of treatments means contrasts, in a random blocks model, using the classical and spatial analysis
Not controllable factors is common occur in experiments, they are responsible for the heterogeneity among parcels. Even executing the three experimentation basic principles in the design (repetition, randomization and local control), even so, may have correlation in errors and, therefore, spatial dependence in the area of study. If that autocorrelation struc
Publicado em: 2008
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28. Estimativas de funÃÃes de covariÃncia para caracterÃsticas de crescimento da raÃa tabapuà utilizando modelo de regressÃo aleatÃria / Estimates of service for covariÃncia characteristics of growth of race tabapuà using model regressÃo random
The study used 28,873 weight records taken along the life of 6.471 animals of the race TabapuÃ, finery birth to 660 days of age, belonging to the animal archives of the Brazilian Association of Zebu Breeders (ABCZ) to estimate the covariÃnce functions using the models of random regression. The genetic, addictive direct an permanent environmental effects we
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/02/2007
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29. Bayesian inference in a quantitative genetic study of growth traits in Nelore cattle (Bos indicus)
The objective of this study was to estimate (co)variance components and genetic parameters for weights (W) and scrotal circumferences (SC) at 365 and 450 days of age, of Nelore (Bos indicus) cattle, using Bayesian inference in single and multiple-trait animal models. The fitted linear models included, besides the animal and residual random effects, the conte
Genetics and Molecular Biology. Publicado em: 2007
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30. TESTS WITH CONDITIONAL FREQUENTISTS ERRORS AND TESTS WITH INTERPRETATION BAYESIAN AND CONDITIONAL FREQUENTISTS. / TESTES COM ERROS FREQÃENTISTAS CONDICIONAIS E TESTES COM INTERPRETAÃÃO BAYESIANA E FREQÃENTISTA CONDICIONAL
The Neyman-Pearson tests of hypotheses present probabilities of error independent of the observed data; this is an enormous source of critics. In the significance tests the p-value is used, but this is not a frequentist measuring.Kiefer (1977) formalized a frequentist methodology dependent of the data. The sample space is partitioned using a partitioning fun
Publicado em: 2007
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31. Planejamento de experimentos bayesianos: aplicações em experimentos na presença de tendências lineares.
Inicialmente apresentamos uma introdução geral sobre planejamentos de experimen- tos, em especial, o planejamento fatorial geral e o planejamento fatorial 2k, e alguns critérios Bayesianos na construção de planejamentos de experimentos. Na prática, usual- mente o pesquisador pode ter conhecimento a priori de especialistas das quantidades a serem estima
Publicado em: 2007
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32. Uso de métodos bayesianos em testes de vida acelerados no controle da qualidade de produtos industriais.
In this work, we introduce a Bayesian approach for quality control of industrial products, assuming units in test under stress levels higher than the usual level. We assume dierent distributions for the lifetimes of the units under a type II censoring mechanism and a general stress-response model that includes the usual accelerated life test models. Using a
Publicado em: 2006
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33. Estimation of genetic parameters of milk and fat yield of Brown-Swiss cows using frequentist and bayesian methodologies / Estimação de parâmetros genéticos de produção de leite e de gordura da raça Pardo-suíça, utilizando metodologias freqüentista e bayesiana
First lactation data of 6.262 Brown-Swiss cows from 311 herds, daughters of 803 sires with calving between 1980 and 2003 were used to estimate genetic parameters for milk and fat production traits. The components of variance were estimated by restricted maximum likelihood (REML) and bayesian methods, using animal model with uni and two-traits analisys . The
Publicado em: 2006
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34. Métodos atuariais aplicados à determinação da taxa de prêmio de contratos de seguro agrícola: um estudo de caso. / Actuarial methods applied to the determination of the premium rate of crop insurance contracts: a case study.
This research analyses alternative methods of pricing agricultural insurance contract based on regional yields. The premium rate is calculated using three different approaches: nonparametric method to estimate the density of the agricultural yield; parametric approach fitting the Normal and Beta distributions; and, hierarchical Bayesian models. The data gene
Publicado em: 2005
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35. "Análise bayesiana da probabilidade de permanência no rebanho como característica de seleção para a raça Nelore" / Bayesian inference for stayability as selection criteria in Nelore beef cattle
As novas biotecnologias em reprodução, como a transferência de embriões e a fecundação in vitro, de certo modo, despertaram nos produtores e pesquisadores da área de melhoramento animal o interesse na seleção de fêmeas, antes pouco explorada dada a grande ênfase empregada na seleção e avaliação de reprodutores machos. A cada ano é percebido q
Publicado em: 2003
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36. An evaluation of factors influencing Bayesian learning systems.
OBJECTIVES: To examine the influences of situational and model factors on the accuracy of Bayesian learning systems. DESIGN: This study examines the impacts of variations in two situational factors, training sample size and number of attributes, and in two model factors, choice of Bayesian model and criteria for excluding model attributes, on the overall acc