Non Parametric Estimation
Mostrando 13-24 de 36 artigos, teses e dissertações.
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13. Non-parametric regression with correlated errors using wavelets / Regressão não-paramétrica com erros correlacionados via ondaletas.
In this thesis, rates of convergence to zero are obtained for the estimation risk, for non-parametric regression using wavelets, when the errors are correlated. Four non-parametric regression methods using wavelets, with un-equally spaced design are studied in the presence of correlated errors, that come from stochastic processes. Conditions on the errors an
Publicado em: 2008
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14. Estimação não parametrica da trajetoria percorrrida por um veiculo autonomo / Non-parametric curve estimation of an autonomous vehicle trajectory
The objective of this study is to find a smooth function joining two points A and B with minimum length constrained to avoid fixed subsets. A penalized nonparametric method of finding the best path is proposed. The method is generalized to the situation where stochastic measurement errors are present. In this case, the proposed estimator is consistent, in th
Publicado em: 2008
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15. Avaliação contingente de serviços de saneamento básico em Palmas-TO / Contingent valuation of services of basic santation in Palmas- TO
The services of basic sanitation have crucial importance in relation to population welfare because the absence of this kind of services contribute negatively to population healthy, environment and have some impacts on the government budget. The main aim of this thesis is to estimate the willingness to pay relative to the improvement of basic sanitation (WTP)
Publicado em: 2008
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16. Análise de sobrevivência do tomateiro a Phytophthora infestans / Analysis of the survival of the tomato plant Phytophthora infestans
Reburning caused by Phytophthora infestansis is characterized as an aggressive disease of great destructive impact, capable of limiting or even hindering the economic cultivation of the tomato plant under conditions of high humidity and low temperatures. In view of the problems reburning can cause to tomato plant crops, this work aimed to: 1) fit models to d
Publicado em: 2008
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17. SMOOTH TRANSITION LOGISTIC REGRESSION MODEL TREE / MODELO DE REGRESSÃO LOGÍSTICA COM TRANSIÇÃO SUAVE ESTRUTURADO POR ÁRVORE (STLR-TREE)
The main goal of this work is to adapt the STR-Tree model, which is the combination of a Smooth Transition with Regression model with Classi cation and Regression Tree (CART), in order to use it in Classification. Some changes were made in its structural form and in the estimation. Due to the fact we are doing binary dependent variables classification, is ne
Publicado em: 2008
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18. Regiões de confiança para a localização do ponto estacionário em superfícies de resposta, usando o método "bootstrap" Bayesiano / Confidence region on the location of the stationary point in response surfaces, a Bayesian bootstrap approach
Experiments in which one or more response variables are influenced by several quantitative factors are very common in agricultural, chemistry, biology and other areas. In this case, the research question consists in studying this relation, being of great utility the use of response surface methodology (RSM). In this context determining the level of the facto
Publicado em: 2008
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19. Otimização dinâmica da fermentação alcoólica no processo embatelada alimentada
This work presents an experimental and theoretical study of the dynamic optimization of the alcoholic fermentation in fed-batch mode utilizing the Saccharomyces cerevisiae yeast in a bioreactor of 5 L. Twelve experiments were carried out, three them in batch and nine in fed-batch mode, with initial sucrose concentrations between 154 and 195.6 g/L for the exp
Publicado em: 2008
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20. OtimizaÃÃo dinÃmica da fermentaÃÃo alcoÃlica no processo embatelada alimentada
This work presents an experimental and theoretical study of the dynamic optimization of the alcoholic fermentation in fed-batch mode utilizing the Saccharomyces cerevisiae yeast in a bioreactor of 5 L. Twelve experiments were carried out, three them in batch and nine in fed-batch mode, with initial sucrose concentrations between 154 and 195.6 g/L for the exp
Publicado em: 2008
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21. A cross-country non parametric estimation of the returns to factors of production and the elasticity of scale
Este artigo utiliza regressão local para estimar a elasticidade do produto em relação ao trabalho, capital humano, capital físico e a elasticidade de escala para 90 países em 1985 e 1995. Os resultados corroboram a hipótese de retorno constante de escala. Contudo, os países com reduzida relação capital-trabalho possuem importantes diferenças nas el
Nova Economia. Publicado em: 2007-04
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22. Factors associated with Intra-Uterine Growth Retardation newborns in public maternity in Salvador. / Fatores associados ao retardo de crescimento intra-uterino em recém nascidos em maternidades públicas da cidade de Salvador-Bahia.
Factors associated with Intra-Uterine Growth Retardation have not been fully clarified. Small newborns for gestational age have shown different hematological parameters compared appropriate newborns for gestational and preterm newborns. There are also methodological limitations concerning accuracy to determine gestational age. Objectives: To determine factor
Publicado em: 2007
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23. FUZZY PROBABILITY ESTIMATION FROM IMPRECISE DATA / ESTIMAÇÃO DE PROBABILIDADE FUZZY A PARTIR DE DADOS IMPRECISOS
There are three kinds of uncertainty: one due to randomness, another due to incomplete knowledge and a third one due to vague or imprecise knowledge. Sometimes two kinds of uncertainty occur at the same time, especially in random experiments based on imprecise data. To model randomness when the probability distribution related to an experiment is unknown, a
Publicado em: 2006
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24. Vibrações ressonantes não-lineares em estruturas tipo viga sob excitação paramétrica e combinada / Nonlinear resonance vibrations in beam type structures under parametric and combined excitations
This document presents results of theoretical and experimental investigations on the non-linear vibration characteristics of an important class of flexible structures. The motivation for such a study arises mainly from the increasing need for lightweight structural members. The weight reduction associated to the use of novel materials contribute to the incre
Publicado em: 2006