Latent Variable Models
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Belief patterns and drug use in a sample of Brazilian youth: an exploratory latent class analysis
Objective: Adolescent substance abuse is a public health concern worldwide, and its prevention is the subject of numerous programmatic efforts. Yet, little research exists on the structure of drug-related belief patterns in youth and their utility in preventive program planning. The aim of this study is to determine the structure of drug-related beliefs amo
Braz. J. Psychiatry. Publicado em: 2020-06
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2. Percepção pública das instalações nucleares / Public perception of nuclear installations
The key for nuclear renaissance is public acceptance. Facing energetic needs that occur around the world and lack of resources, the work of characterizing and proposing new models to represent public opinion is extremely important to all stakeholders. Even though public opinions study on risks is relatively recent, may approaches of this subject have been su
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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3. Generalized linear mixed models for the genetic evaluation of binary reproductive traits: a simulation study
The objective of this study was to evaluate the use of probit and logit link functions for the genetic evaluation of early pregnancy using simulated data. The following simulation/analysis structures were constructed: logit/logit, logit/probit, probit/logit, and probit/probit. The percentages of precocious females were 5, 10, 15, 20, 25 and 30% and were adju
Revista Brasileira de Zootecnia. Publicado em: 2012-01
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4. O acesso e a utilização dos serviços de saúde materno-infantis no município de Juiz de Fora - MG
Health inequalities come to being in many different ways in the health-disease process, be it in the form of access or the utilization of health services. Although many studies undertaken in Brazil have highlighted the existence of inequities in the utilization of health services, there are limitations in the interpretation of such approach. This study analy
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011
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5. Contribuição do aninhamento do modelo Eta no modelo de circulação geral atmosférico e acoplado oceano-atmosfera do CPTEC na previsão do clima de verão sobre a América do Sul e Atlântico Tropical / Contribution of nesting regional eta model in atmospheric and coupled ocean-atmosphere general circulation model in seasonal forecast over South America and Tropical Atlantic
This work aims to verify the advantage of nesting Eta model in global coupled ocean-atmosphere model (CGCM) in climate forecast over South America and Tropical Atlantic. Three ensembles hindcasts of ten summer (December, January and February) between 1997 and 2006. The hindcasts consist of two global models from CPTEC, one atmospheric (AGCM;T062L28) and anot
Publicado em: 2010
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6. Essays in Applied Econometrics
This thesis is divided in three essays. The first essay examines the reactions by incumbent airlines to the threat and actual entry of the low-cost carrier Gol in the Brazilian domestic air transport market. By estimating the reactions in prices, quantities and supply variables, it investigates the plausibility of theories of entry deterrence and accommodati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200810
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7. Inferência bayesiana para o tamanho de uma população fechada com erros de registros de dados amostrais
In this dissertation we determine maximum likelihood and bayesian estimates of the size of a closed population, from two lists of data of elements of the population. It has been supposed that the registers of the individual information in the lists are capable of mismatches and, with relation to the bayesian method, the prioris distributions are noninformati
Publicado em: 2008
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8. Desenvolvimento de tecnicas quimiometricas de compressão de dados e deredução de ruido instrumental aplicadas a oleo diesel e madeira de eucalipto usando espectroscopia NIR / Development of chemometric technics for data compression and reduction of diesel oil and eucalypus wood employing NIR spectroscopy
This work describes two techniques for spectral variable and sample selection based on the Successive Projections Algorithm (SPA), aiming the construction of multivariate regression models. Also, the wavelet transform was employed to solve problems related to noise reduction associated with spectroscopic data in the near infrared spectral region (NIR), and e
Publicado em: 2007
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9. Métodos quimiométricos aplicados na determinação espectrofotométrica de misturas de aminoácidos / Chemometrics methods applied in the spectrophotometric determination of amino acid mistures
The purpose of this paper was to make simultaneous amino acid determination using methods of multivariated calibration. The method is based on the reaction between amino acids and sodium 1, 2-naphthoquinone 4-sulphonate (NQS). A set of 32 synthetic mixtures with different concentrations of Phenylalanine Histidine, Proline, Tryptophan and Isoleucine was prepa
Publicado em: 2007
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10. Balanço de radiação, energia e fluxo de CO2 em ecossistema de manguezal na Amazônia / Radiation and energy balance and fluxes of CO2 in a Amazon mangrove ecosystem
This work use the longest series of continuous meteorological data and fluxes measurements of CO2, sensible heat and latent heat made in Amazon mangrove ecosystem. The series used in this study corresponds to the period of November, 2002 to August, 2003. The meteorological data were collected using an EDISOL system based on the hedí covariance technique. Th
Publicado em: 2006
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11. "Métodos de estimação na teoria de resposta ao item" / Estimation methods in item response theory
Neste trabalho apresentamos os mais importantes processos de estimação em algumas classes de modelos de resposta ao item (Dicotômicos e Policotômicos). Discutimos algumas propriedades desses métodos. Com o objetivo de comparar o desempenho dos métodos conduzimos simulações apropriadas.
Publicado em: 2003
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12. Modelos lineares generalizados mistos para dados longitudinais. / Generalized linear mixed models in longitudinal data.
Experiments which response variables are proportions or counts are very common in several research areas, specially in the area of agriculture. The theory of generalized linear models, well difused (McCullagh &Nelder, 1989; Demetrio, 2001), is used for analyzing these experiments where the responses are independent. If the estimated variance is greater than
Publicado em: 2003