Exponential Family
Mostrando 1-12 de 75 artigos, teses e dissertações.
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1. Estimating leaf area of basil cultivars through linear dimensions of leaves
ABSTRACT Ocimum basilicum L. (basil) is an annual herb belonging to the Lamiaceae family that has economic importance for many regions around the world. Thus, ecophysiological studies are needed to assess this species growth and dispersal. This work aimed to obtain equations from regression models that meaningfully estimate the leaf area of basil cultivars u
Revista Ceres. Publicado em: 2022
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2. Genome-wide analysis of EgEVE_1, a transcriptionally active endogenous viral element associated to small RNAs in Eucalyptus genomes
Abstract Endogenous viral elements (EVEs) are the result of heritable horizontal gene transfer from viruses to hosts. In the last years, several EVE integration events were reported in plants by the exponential availability of sequenced genomes. Eucalyptus grandis is a forest tree species with a sequenced genome that is poorly studied in terms of evolution a
Genet. Mol. Biol.. Publicado em: 23/02/2017
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3. The Poisson-exponential regression model under different latent activation schemes
In this paper, a new family of survival distributions is presented. It is derived by considering that the latent number of failure causes follows a Poisson distribution and the time for these causes to be activated follows an exponential distribution. Three different activationschemes are also considered. Moreover, we propose the inclusion of covariates in t
Comput. Appl. Math.. Publicado em: 2012
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4. Modelo de mistura padrão com tempos de vida exponenciais ponderados
In this work, we brie_y introduce the concepts of long-term survival analysis. We dedicated ourselves exclusively to the standard mixture cure model from Boag (1949) and Berkson &Gage (1952), showing its deduction and presenting the imunes probability function, which is taken from the model itself and we investigated the identi_ability issues of the mixture
Publicado em: 2010
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5. The log-exponentiated generalized gamma regression model with censored data / Modelo de regressão log-gama generalizado exponenciado com dados censurados
In the present study, we propose a regression model using the exponentiated generalized gama (EGG) distribution for censored data, this new distribution is an extension of the generalized gama distribution. The EGG distribution (CORDEIRO et al., 2009) that has four parameters it can model survival data when the risk function is increasing, decreasing, form o
Publicado em: 2010
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6. Modelos não-lineares da família exponencial
The exponential family nonlinear models are an extension of the generalized models, opening various options for the distribution of the variable answer and allowing larger flexibility for the connection between the average and the systematic component. These models, for being less restrictive, having been used to model several phenomena in the nature. To est
Publicado em: 2009
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7. Further statistical methods in regression models of the exponential family / Aperfeiçoamento de métodos estatísticos em modelos de regressão da família exponencial
In this work, we develop three topics related to the exponential family nonlinear regression. First, we obtain the asymptotic covariance matrix of order $n^$, where $n$ is the sample size, for the maximum likelihood estimators corrected by the bias of order $n^$ in generalized linear models, considering the precision parameter known. Second, we calculate an
Publicado em: 2009
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8. The exponential family nonlinear models revisited / Modelos não lineares de família exponencial revisitados
O objetivo deste trabalho é fazer uma revisão dos modelos não lineares de família exponencial (Cordeiro &Paula (1989); Wei (1998)) para respostas independentes e apresentar possíveis extensões para o caso de dados correlacionados. Inicialmente são apresentados exemplos ilustrativos, alguns dos quais são reanalizados ao longo do texto. Em seguida são
Publicado em: 2009
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9. Risky assets performance measures analysis: a study of potential investment, Sharpe ratio and generalized Sharpe ratio indexes. / Análise de medidas de desempenho de ativos de risco: um estudo dos índices de potencial de investimento, Sharpe e Sharpe generalizado
This master dissertation studies and compares the characteristics of Sharpe ratio and its variants, SRc and SRd, generalized Sharpe ratio (GSR) and investment potential (IP), both GSR and IP associated to any utility function. By the fact that GSR and IP are identical indexes, empiric tests were conducted between SRc and GSR. The indexes were evaluated theor
Publicado em: 2008
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10. 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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11. 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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12. Estimação e teste de hipótese baseados em verossimilhanças perfiladas / "Point estimation and hypothesis test based on profile likelihoods"
The profile likelihood function is not genuine likelihood function, and profile maximum likelihood estimators are typically inefficient and inconsistent. Additionally, the null distribution of the likelihood ratio test statistic can be poorly approximated by the asymptotic chi-squared distribution in finite samples when there are nuisance parameters. It is t
Publicado em: 2005