Covariates Selection
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Prediction of soil classes in a complex landscape in Southern Brazil
Resumo: O objetivo deste trabalho foi avaliar o uso da seleção de covariáveis por conhecimento especializado no desempenho de modelos de predição de classes de solos em uma paisagem complexa, para identificar o melhor modelo preditivo para o mapeamento digital de solos na região Sul do Brasil. Um total de 164 pontos foram amostrados em campo, com uso d
Pesq. agropec. bras.. Publicado em: 11/11/2019
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2. Selection of Environmental Covariates for Classifier Training Applied in Digital Soil Mapping
ABSTRACT A large number of predictor variables can be used in digital soil mapping; however, the presence of irrelevant covariables may compromise the prediction of soil types. Thus, algorithms can be applied to select the most relevant predictors. This study aimed to compare three covariable selection systems (two filter algorithms and one wrapper algorithm
Rev. Bras. Ciênc. Solo. Publicado em: 07/01/2019
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3. Prediction of Topsoil Texture Through Regression Trees and Multiple Linear Regressions
ABSTRACT: Users of soil survey products are mostly interested in understanding how soil properties vary in space and time. The aim of digital soil mapping (DSM) is to represent the spatial variability of soil properties quantitatively to support decision-making. The goal of this study is to evaluate DSM techniques (Regression Trees - RT and Multiple Linear R
Rev. Bras. Ciênc. Solo. Publicado em: 16/04/2018
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4. Genetic and Environmental Effects on Tonic Immobility Duration of Red-Winged Tinamou Applying Survival Analysis
ABSTRACT Fear behavioral studies provide knowledge on animal welfare, and fearful behaviors can be used as selection criteria of individuals adapted to intensive rearing system. The survival analysis methodology was applied to estimate tonic immobility (TI) duration, as an indicator of fear, of red-winged tinamous (Rhynchotus rufescens) reared in captivity a
Braz. J. Poult. Sci.. Publicado em: 2018-04
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5. Population structure correction for genomic selection through eigenvector covariates
Abstract We proposed a population structure correction for genome-wide selection based on covariance analysis via eigenvector (EVG) decomposition. The agreement between the predicted and true breeding values was evaluated by independent cross-validation data sets. Other correction methods such as correction via principal components, best linear unbiased pred
Crop Breed. Appl. Biotechnol.. Publicado em: 2017-12
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6. A MODEL SELECTION PROCEDURE IN MIXTURE-PROCESS EXPERIMENTS FOR INDUSTRIAL PROCESS OPTIMIZATION
We present a model selection procedure for use in Mixture and Mixture-Process Experiments. Certain combinations of restrictions on the proportions of the mixture components can result in a very constrained experimental region. This results in collinearity among the covariates of the model, which can make it difficult to fit the model using the traditional me
Pesqui. Oper.. Publicado em: 2015-08
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7. Factors influencing the selection of communal roost sites by the Black Vulture Coragyps atratus (Aves: Cathartidae) in an urban area in Central Amazon
Increasing populations of the Black Vulture, Coragyps atratus (Bechstein, 1793) and the capacity this bird has to live near humans has resulted in vulture-human conflicts. These conflicts increase the need for the effective management of vultures. Improved understanding of communal roosting dynamics is a key aspect of vulture biology that provides informatio
Zoologia (Curitiba). Publicado em: 20/12/2013
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8. A mão invisível no teto de vidro
The aim of this study was to investigate the existence of the phenomenon also known as Glass Ceiling "Glass Ceiling". This phenomenon sets a limit on the invisible career, preventing women from ascending professionally. Can be empirically verified, that the earnings differential between men and women, has an acceleration to the final part of the distribution
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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9. Seleção de covariáveis para ajuste de regressão logística na análise de abundância de invertebrados edáficos em diferentes agroecossistemas / Covariates selection for logistic regression adjustment in analysis of edaphic invertebrates abundance in different agroecosystems
Logistic regression is the analysis usual statistical method used to verify the relationship between a dichotomous variable response and the interest explanatory variables. This work aimed to carry out a study about the factors influencing the invertebrates abundance on the soil under different management forms, using the logistic regression. This objective
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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10. Identification and estimation of interventions using changes in inequality measures
This paper presents semiparametric estimators of changes in inequality measures of a dependent variable distribution taking into account the possible changes on the distribu- tions of covariates. When we do not impose parametric assumptions on the conditional distribution of the dependent variable given covariates, this problem becomes equivalent to estimati
Publicado em: 16/06/2010
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11. Conditions of mouth status and oral cancer in smokers / Condições orais e câncer de boca em fumantes
The aim of this study was to assess the hypothesis that conditions of mouth status (the use of dentures, recurrent sores by ill-fitting dentures or ill-positioned or broken teeth, frequent intake of hot beverages and irregular or infrequent tooth brushing) may interact with tobacco, alcohol, diet and socioeconomic status in the carcinogenesis of oral cancer.
Publicado em: 2008
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12. Avaliação de características de carcaça e qualidade de carne e predição da composição corporal de grupos genéticos de bovinos selecionados para peso pós-desmame / Carcass characteristics and meat quality evaluation and body composition prediction of beef cattle genetic groups selected for post weaning weight
Animal production, specially beef cattle carcass characteristics and empty body composition were discussed in the first chapter. On the second chapter data from nine studies were compiled to evaluate the effects of selection for post-weaning weight on carcass characteristics and meat quality in experimental herds of control Nellore (NeC) and selected Nellore
Publicado em: 2008