Penalized Likelihood
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Genetic analyses of days to calving their relationships with other traits in a Canchim herd.
Heritabilities and genetic correlations in a Canchim beef cattle herd were estimated using data on the following traits: male scrotal circumference at twelve months (SC12); days to first calving (DFC) for heifers; days to calving (DC) for cows; male and female weight (W) at twelve months (W12); heifer weight at the start of the first breeding season (WFBS) a
Genetics and Molecular Biology. Publicado em: 2011
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2. Estratégias para aumentar a sensibilidade da farmacovigilância em Portugal
OBJETIVO: Avaliar os resultados de intervenção para melhoria da quantidade e relevância das notificações de reacções adversas a medicamentos. MÉTODOS: Foi implementado um estudo controlado aleatorizado, por agrupamentos em farmacêuticos a exercer actividade profissional na região norte de Portugal, em 2007. Após aleatorização, 364 indivíduos fo
Revista de Saúde Pública. Publicado em: 12/11/2010
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3. Testes estatísticos em regressão logística sob a condição de separabilidade / Statistical tests in logistic regression under separability condition
Logistic regression is the statistical method of analysis used when the objective is to verify the relationship between one dichotomic response variable and explicative variables of interest. Usually, the model parameters are estimated through the genuine maximum likelihood method, and tests about these parameters are built assuming approximated distribution
Publicado em: 2010
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4. Variable selection for survival models based on penalized likelihood / Seleção de covariáveis para modelos de sobrevivência via verossimilhança penalizada
Variable selection is an important step when setting a parsimonious model. However, the most popular variable selection techniques, such as the best subset variable selection and the stepwise method, do not take into account inherent stochastic errors in the variable selection step. This work presents a study of alternative procedures to more popular methods
Publicado em: 2009
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5. Modelos mistos aditivos semiparamétricos de contornos elípticos / Elliptical contoured semiparametric additive mixed models.
Neste trabalho estendemos os modelos mistos semiparamétricos propostos por Zhang et al. (1998) para uma classe mais geral de modelos, a qual denominamos modelos mistos aditivos semiparamétricos com erros de contornos elípticos. Com essa nova abordagem, flexibilizamos a curtose da distribuição dos erros possibilitando a escolha de distribuições com cau
Publicado em: 2009
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6. Genetic analyses of days to calving and their relationships with other traits in a Canchim cattle herd
Heritabilities and genetic correlations in a Canchim beef cattle herd were estimated using data on the following traits: male scrotal circumference at twelve months (SC12); days to first calving (DFC) for heifers; days to calving (DC) for cows; male and female weight (W) at twelve months (W12); heifer weight at the start of the first breeding season (WFBS) a
Genetics and Molecular Biology. Publicado em: 2007
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7. Soft and hard classification by reproducing kernel Hilbert space methods
Reproducing kernel Hilbert space (RKHS) methods provide a unified context for solving a wide variety of statistical modelling and function estimation problems. We consider two such problems: We are given a training set {yi, ti, i = 1, … , n}, where yi is the response for the ith subject, and ti is a vector of attributes for this subject. The value of yi
National Academy of Sciences.