Bayesian Criteria
Mostrando 13-24 de 40 artigos, teses e dissertações.
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13. Estimation of genetic parameters for growth traits in Tabapuã cattle using a multi-trait model
To provide information that can contribute to the genetic evaluation and selection in Tabapuã cattle, genetic parameters were estimated for growth traits using a multi-trait animal model. (Co)variance components were estimated by a Bayesian approach using the Gibbs Sampler. Moderate and similar responses to selection are expected when selecting for weights
R. Bras. Zootec.. Publicado em: 2013-08
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14. Phylogenetic study of Class Armophorea (Alveolata, Ciliophora) based on 18S-rDNA data
The 18S rDNA phylogeny of Class Armophorea, a group of anaerobic ciliates, is proposed based on an analysis of 44 sequences (out of 195) retrieved from the NCBI/GenBank database. Emphasis was placed on the use of two nucleotide alignment criteria that involved variation in the gap-opening and gap-extension parameters and the use of rRNA secondary structure t
Genet. Mol. Biol.. Publicado em: 2013
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15. Epidemiologia dos subtipos de depressão: análise de classes latentes dos sintomas depressivos em uma amostra populacional da região Metropolitana de São Paulo / Epidemiology of subtypes of depression: latent class analysis of depressive symptoms in a population-based sample of São Paulo Metropolitan Area
Introduction. Depression is a heterogeneous clinical syndrome characterized by distinct symptom profiles. However, few studies have investigated depressive subtypes in the community and their sociodemographic and clinical correlates, differentiating them on the presentation according to gender. Methods. Data comes from the São Paulo Megacity Mental Health S
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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16. Persistency of lactation using random regression models and different fixed regression modeling approaches
Milk yield test-day records on the first three lactations of 25,500 Holstein cows were used to estimate genetic parameters and predict breeding values for nine measures of persistency and 305-d milk yield in a random regression animal model using two criteria to define the fixed regression. Legendre polynomials of fourth and fifth orders were used to model t
R. Bras. Zootec.. Publicado em: 2012-09
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17. Model selection for quantitative trait loci mapping in a full-sib family
Statistical methods for mapping quantitative trait loci (QTLs) in full-sib forest trees, in which the number of alleles and linkage phase can vary from locus to locus, are still not well established. Previous studies assumed that the QTL segregation pattern was fixed throughout the genome in a full-sib family, despite the fact that this pattern can vary amon
Genetics and Molecular Biology. Publicado em: 13/07/2012
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18. Filogenia e biogeografia do complexo Croton pallidulus(Euphorbiaceae), inferidas por sequências de DNA e marcadores AFLP / Phylogeny and biogeography of complex Croton pallidulus (Euphorbiaceae), inferred by DNA sequences and AFLP markers
The project addressed the detection of genetic polymorphisms in a Complex formed by some species of widespread occurrence in southeast of Brazil, whose limits are not yet well established, by presenting great morphological polymorphism that raises doubts as to whether it is a single or various species. The following species were studied: C. ceanothifolius, C
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2011
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19. Análise da diversidade genética e evolução molecular de Infectious bursal disease virus (IBDV) / Analysis of genetic diversity and molecular evolution of Infectious bursal disease virus (IBDV)
Infectious bursal disease virus (IBDV) is considered one of the most important pathogens for chickens of the poultry industry. Considering the differences in levels of virulence among isolates of IBDV, this paper proposes a non-arbitrary genotyping definition and a unified nomenclature for the viral isolates of IBDV. In this approach, the sets of 96 VP2 and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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20. Novas propostas em filtragem de projeções tomográficas sob ruído Poisson
In this dissertation we present techniques for filtering of tomographic projections with Poisson noise. For the filtering of the tomogram projections we use variations of three filtering techniques: Bayesian estimation, Wiener filtering and thresholding in Wavelet domain. We used ten MAP estimators, each estimator with a diferent probability density as prior
Publicado em: 2010
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21. Especificação do tamanho da defasagem de um modelo dinâmico
Several techniques are proposed to determine the lag length of a dynamic regression model. However, none of them is completely satisfactory and a wrong choice could imply serious problems in the estimation of the parameters. This dissertation presents a review of the main criteria for models selection used in the classical methodology and presents a way for
Publicado em: 2009
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22. Modelagem simultânea de média e dispersão e aplicações na pesquisa agronômica / Joint modeling of mean and dispersion and applications to agricultural research
Several experimental designs that are currently applied are based on agricultural experiments. These experimental data are, usually, analised with statistical models that assume constant residual variance (or homogeneous), as basic assumption. However, this assumption shows hard to stand for, when environmental or external factors exert strong influence over
Publicado em: 2009
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23. Probability distribution and sample dimension for particle size in forage grasses / Distribuição de probabilidade e dimensionamento amostral para tamanho de partícula em gramíneas forrageiras
The purpose of this study was to identify the probability distribution of variable particle size in forages grasses and to do a sample dimension. For this was carried out an exploratory analysis of the data obtained from the experiment planned in randomized blocks. Each sample of the overall data was adjusted to Normal, Gama, Beta and Weibull distributions.
Publicado em: 2009
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24. Medidas de persistência da produção de leite em rebanhos Gir Leiteiro utilizando modelos de regressão aleatória / Persistency of milk yield measures in Gyr herds using random regression models
Data comprising 27,000 test-day milk yield (TDMY) records of 3,362 first lactations of Gyr cows calving between 1990 and 2007 were used to compare random regression models for biweekly TDMY and to evaluate persistency of lactation milk yield (PS) measures. Records were analyzed by random regression models (RRM). Random trajectories were fitted by Wilminks (W
Publicado em: 2009