Bootstrap Statistical
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Predição de mortalidade em cirurgia de coronária e/ou valva no InCor: validação de dois modelos externos e comparação com o modelo desenvolvido localmente (InsCor) / Mortality prediction in coronary bypass surgery and/or heart valve surgery at InCor: Validation of two external risk models and comparison to the locally developed model (InsCor)
Objetivo: Novas tendências na avaliação de risco trazem evidências de que modelos externos recalibrados ou remodelados funcionam melhor localmente. O objetivo deste estudo foi validar dois modelos externos e formular um modelo local, comparando-os na predição de mortalidade nos pacientes operados de coronária e/ou valva no InCor-HCFMUSP. Método: Entr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/04/2012
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2. IdentificaÃÃo de Pontos Influentes em uma Amostra AleatÃria de PrÃ-formas da DistribuiÃÃo Bingham Complexa (DistÃncia de Cook e MÃtodos de Bootstrap)
The objective of this dissertation is the evaluation and application of influence analysis methods in statistical shape analysis. Through the model of deleting cases (CDM) is obtained a measure of the Cook distance when the data set has the complex Bingham distribution. Through simulations of Monte Carlo and the bootstrap method the estimation of region of c
Publicado em: 2009
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3. MÉTODOS ESTATÍSTICOS APLICADOS AO CÁLCULO DA AMPACIDADE E RISCO TÉRMICO DE LINHAS AÉREAS DE TRANSMISSÃO / STATISTICAL METHODS APPLIED TO AMPACITY AND THERMAL RISK CALCULATION OF OVERHEAD TRANSMISSION LINES
This work presents a new proposition for calculation of statistical ampacity and thermal risks associated to ampacity values by using simulation methods that employ intensive computation. The proposed approach uses Bootstrap and Monte Carlo simulation methods in order to calculate and infer information of statistical ampacity drawn from meteorological variab
Publicado em: 2008
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4. Algoritmos de estimação para Cadeias de Markov de alcance variavel : aplicações a detecção do ritmo em textos escritos / Estimation of algorithms for variable length Markov chains : applications in the detection of rhythm in written texts
No presente trabalho, direcionamos nossos estudos à questão de se encontrar evidências estatísticas na detecção de ritmos em textos escritos, apresentando para isso ferramentas probabilísticas que nos permitam discriminar textos brasileiros e portugueses. Para alcançarmos tais objetivos, abordamos alguns resultados teóricos e práticos em modelagem,
Publicado em: 2008
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5. Predição de valores genotípicos de híbridos de milho com desbalanceamentos de genótipos e ambientes / Predicting maize single-crosses genotypic values under unbalanced number of genotypes and environments
A fase mais difícil e que exige mais recursos em um programa de melhoramento de milho é a avaliação experimental dos híbridos, pois geralmente um elevado número de híbridos necessita ser avaliado em diversos ambientes. Deste modo, tanto o número de híbridos como o de ambientes são limitados pelos recursos disponíveis, o que poderia levar a uma red
Publicado em: 2008
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6. AnÃlise discriminante clÃssica e de nÃcleo: avaliaÃÃes e algumas contribuiÃÃes relativas aos mÃtodos Boosting e Bootstrap
Since information technology is essential for many activities of modern life and massive data sets come with it, data mining has become one of the most important research topics in statistical science. Even thought there are many fields related to data mining, the task of classification still remain as one of the most common in statistical literature. This d
Publicado em: 2007
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7. Bootstrap agregating : an investigation of performance in statistics and neural networks classifiers, numerical evaluation and application on breast cancer diagnostic support. / Agregação via bootstrap: uma investigação de desempenho em classificadores estatísticos e redes neurais, avaliação numérica e aplicação no suporte ao diagnóstico de câncer de mama .
In pattern recognition, the medical diagnosis has received great attention. In gene-ral, the emphasis has been to identify one best model for diagnostic forecast, measured according to generalization ability. In this context, ensembles methods have been eficients, can be considered on the improvement of performance in diagnostic tasks that demand greater pre
Publicado em: 2007
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8. Uma modificação da extensão do algoritmo AID para modelos lineares generalizados usando reamostragem Bootstrap
One of the most frequently situation found by researchers is to find groups of similar individuals. The cluster analysis is a set of statistical techniques that identify mutually exclusive subgroups or classes over individuals, based on their similarity. When then main is to group means of treatments we can use contrasts, multiple comparitions or clustering
Publicado em: 2006
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9. Propriedades estatísticas de estimadores de DEA em fronteiras de produção / Statistical Properties of DEA Estimators in Production Frontiers
In this work is verified how to assess the significance of factors effects in Data Envelopment Analysis (DEA) measures of efficiency. In the theoretical aspect the thesis contributes to the literature extending Bankers theory ([7]) and in the empirical aspect with an application to Brazilian banks comparing asymptotic, bootstrap and probabilistic approaches.
Publicado em: 2006
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10. Avaliação da condição de " tão bom quanto novo":: uma aplicação envolvendo a manutenção de motores convencionais das aeronaves Universal T-5"
After a usual preventive maintenance routine it is usually assumed that a system returns to the condition of As Good As New" (AGAN). This work uses some statistical tools to propose a methodology able to test if a system returns to the Condition of AGAN and, in the cases in which the supposition cannot be validated, to determine a coefficient reliable to mea
Publicado em: 2006
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11. Prediction of hybrid means from a partial circulant diallel table using the ordinary least square and the mixed model methods
By definition, the genetic effects obtained from a circulant diallel table are random. However, because of the methods of analysis, those effects have been considered as fixed. Two different statistical approaches were applied. One assumed the model to be fixed and obtained solutions through the ordinary least square (OLS) method. The other assumed a mixed m
Genetics and Molecular Biology. Publicado em: 2005
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12. AlphaCI: un programa de cálculo de intervalos de confianza para el coeficiente alfa de Cronbach
Cronbach's alpha coefficient is the most popular way of estimating reliability in measurement scales based on Classic Test Theory. When estimating it, researchers usually omit to report confidence intervals of this coefficient, as it is not only recommended by experts, but also required by some journal's guidelines. This situation is because the different me
Psico-USF. Publicado em: 2004-06