Simulation Statistics Models
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Simulation of pattern of gene flow in Canjerana fragments in the Brazilian Atlantic Rainforest for evaluating genetic conservation strategies
RESUMO: O fluxo gênico, cuja efetividade é função do modelo e da taxa, assume especial importância na conservação de recursos genéticos por permitir a conectividade de populações isoladas geograficamente, sujeitas à redução da variabilidade genética. O entendimento de como o fluxo gênico ocorre pode contribuir no planejamento de ações para
Cienc. Rural. Publicado em: 15/07/2019
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2. Evaluation of 12 m Long Turned Down Guardrail End Terminal Using Full-Scale Crash Testing and Simulation
Abstract The beginnings and ends of guardrail designs have the function of providing adequate anchorage for the rest of the system. They should also demonstrate crashworthy performance and should not pose any hazard for errant vehicles. In Europe, the ends of guardrail systems traditionally have incorporated turned down end terminals. Due to its low cost, Tu
Lat. Am. j. solids struct.. Publicado em: 2016-12
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3. Daily counting of manufactured units sent for quality control: a bayesian approach
This paper presents the statistical modeling for daily counting statistics of units that arrive for quality inspection at a food company. Different Poisson regression models were considered in order to analyze the data collected, with a Bayesian focus. The main objective was to forecast the daily average count based on co-variables such as days of the week.
Pesqui. Oper.. Publicado em: 16/07/2013
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4. O uso de quase U-estatísticas para séries temporais uni e multivaridas / The use of quasi U-statistics for univariate and multivariate time series
Classifcation and clustering of time series are problems widely explored in the current literature. Many techniques are presented to solve these problems. However, the necessary restrictions in general, make the procedures specific and applicable only to a certain class of time series. Moreover, many of these approaches are empirical. We present methods for
Publicado em: 2011
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5. SIMULATING POTATO TUBER YIELD IN CLIMATE CHANGE SCENARIOS / SIMULAÇÃO DA PRODUTIVIDADE DE TUBÉRCULOS DE BATATA EM CENÁRIOS DE MUDANÇA CLIMÁTICA
Potato (Solanum tuberosum L.), Solanaceae, is ranked fourth in food amount production, exceeded only by wheat, rice and corn. Brazil has potential in climate and soil for growing potatoes, but with a growing concern of society with possible changes in global and regional climate because of anthropogenic increase in greenhouse gases, this crop may be affected
Publicado em: 2010
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6. Development of pedotransfer functions and their application in agrohydrological models / Desenvolvimento de funções de pedotransferência e sua utilização em modelo agro-hidrológico
Foram desenvolvidas funções de pedotransferência (PTF) para estimar os parâmetros (alfa, n tetar e tetas) do modelo de Van Genuchten (1980) utilizado para descrever curvas de retenção de água no solo. Os dados utilizados foram provenientes de diversas fontes, principalmente de estudos realizados na região Nordeste pelas Universidades, Embrapa e Codev
Publicado em: 2010
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7. Improvement of Wald residual in generalized linear models / Melhoramento do resíduo de Wald em modelos lineares generalizados
The theory of generalized linear models is very used in statistics, not only for modeling data normally distributed, but in the modeling of data whose distribution belongs to the exponential family of distributions. Some examples are binomial, gamma and inverse Gaussian distribution, among others. After tting a model in order to check the adequacy of tting,
Publicado em: 2008
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8. Avaliação da inflência da diferênça de temperatura entre as placas de um molde de injeção no empenamento de peças injetadas
Nowadays, warpage is one of the main concerns at the design stage and manufacturing of plastic components. Warpage hinders the achievement of specified tolerances in the project, resulting in financial losses due to manufacturing problems and consumer complaints. Usually, solution of such problems relies on the knowledge of the designer or process technician
Publicado em: 2008
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9. U-tests for variance components in linear mixed models. / Testes de hipóteses para componentes de variância utilizando estatísticas U
We consider decompositions of U-statistics to obtain tests for null variance components in linear mixed models. Their asymptotic distributions under the null hypothesis are obtained only assuming the existence of the first four moments of the conditional error distribution and the existence of the first two moments of the random effects distribution. Thus, t
Publicado em: 2007
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10. Comparação de modelos com censura intervalar em análise de sobrevivência / Comparison of interval-censored models in survival analysis
Interval-censored results when survival times are not exactly known, knowing only that they occur in an interval. Grouped survival data are particular cases of intervalcensored when individuals are evaluated in the same time-intervals, causing a great number of ties. A common procedure for the analysis this type of data is to ignore the nature of interval-ce
Publicado em: 2007
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11. Detecção e modelagem de padrão espacial em dados binários e de contagem / Detection and modelling of space pattern in binary and counting data
The spatial distribution of insects and diseases in commercial fields is important for the efficient application of pesticides. However, in the past this has not been considered in crop management recommendations, experiment planning and sampling plans. The papers presented in this thesis were motivated by two different situation, one envolving count data an
Publicado em: 2007
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12. Verification by Monte Carlo simulation of the efficiency of application of the likelyhood ratio test for identity of non-linear models / VerificaÃÃo por simulaÃÃo monte carlo da eficiÃncia da aplicaÃÃo do teste de razÃo de verossimilhanÃa para identidade de modelos nÃo lineares
An alternative to compare non-linear models is given by means of the test of identity of models. The statistics utilized normally is given by means of the likelihood ratio. Aiming to evaluate by means of the Monte Carlo simulation the performance of this test, by the aid of the different sample models, number of equations, robustness and different models, th
Publicado em: 2006