Maximum Likelihood Estimates
Mostrando 13-24 de 122 artigos, teses e dissertações.
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13. Three essays on local demand for public services
Local provision of public services has the positive effect of increasing the efficiency because each locality has its idiosyncrasies that determine a particular demand for public services. This dissertation addresses different aspects of the local demand for public goods and services and their relationship with political incentives. The text is divided in
Publicado em: 03/05/2012
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14. Estimates of genetic parameters for visual scores and their correlation with production and reproductive traits in Brahman cattle
The objective of this study was to evaluate the association of visual scores of body structure, precocity and muscularity with production (body weight at 18 months and average daily gain) and reproductive (scrotal circumference) traits in Brahman cattle in order to determine the possible use of these scores as selection criteria to improve carcass quality. C
Revista Brasileira de Zootecnia. Publicado em: 2012-06
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15. Selection for higher body weight in Nelore cattle is effective in achieving an increase of longissimus muscle area without reducing subcutaneous fat thickness
The objectives of this study were to estimate heritabilities and genetic and phenotypic correlations between carcass traits measured by ultrasound and other economically important traits generally used as selection criteria in beef cattle and to estimate the genetic changes in the carcass traits as a result of selection for post-yearling weight. Carcass trai
Revista Brasileira de Zootecnia. Publicado em: 2012-06
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16. Parâmetros genéticos para características lineares de tipo e produtivas em vacas da raça holandesa no Brasil / Genetic parameters for linear type and yield traits in holstein cows in brazil
The objective of this study was to estimate genetic and phenotypic parameters for 21 linear type traits over the final score and milk yield traits (MY), fat (FY) and protein (PP) in herds of Holstein dairy cattle in Brazil. The 18,500 records used in this study were collected by staff of the Brazilian Association of Cattle Breeders of Holstein between 1994 a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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17. Genetic approaches for studying transgene inheritance and genetic recombination in three successive generations of transformed tobacco
Transgene integration into plant genomes is a complex process accompanied by molecular rearrangements. Classic methods that are normally used to study transgenic population genetics are generally inadequate for assessing such integration. Two major characteristics of transgenic populations are that a transgenic genome may harbor many copies of the transgene
Genetics and Molecular Biology. Publicado em: 2012
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18. Efeito da redução da variação da duração de lactação na avaliação genética de bovinos leiteiros mestiços.
A partir de dados de controle leiteiro obtidos junto à Associação Brasileira dos Criadores de Girolando, os efeitos da remoção da variação na duração da lactação sobre a comparação de desempenho produtivo de vários grupos genéticos Holandês x Gir, foram estudados através da comparação dos resultados obtidos a partir das três metodologias
Revista Ciência Agronômica. Publicado em: 2011
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19. Estimativas de componentes de variÃncias e de valores genÃticos para caracterÃsticas de crescimento, reproduÃÃo e habilidade materna em ovinos da raÃa Somalis Brasileira / Estimates of variance components and breeding values for growth, reproductive and maternal traits of Brazilian Somali hair sheep
The aims of this study were to estimate genetic parameters for growth, reproductive and maternal traits and assess the different adjustments of fixed effects in the prediction of breeding values for weight and weight gain at weaning of Brazilian Somali sheep, reared in semi-arid. Data from the NÃcleo de ConservaÃÃo da Embrapa Caprinos e Ovinos, located in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2010
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20. Genetic parameters for milk, fat and protein yields in Murrah buffaloes (Bubalus bubalis Artiodactyla, Bovidae)
The objective of the present study was to estimate genetic parameters for test-day milk, fat and protein yields and 305-day-yields in Murrah buffaloes. 4,757 complete lactations of Murrah buffaloes were analyzed. Co-variance components were estimated by the restricted maximum likelihood method. The models included additive direct genetic and permanent enviro
Genetics and Molecular Biology. Publicado em: 22/01/2010
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21. Eliminação de parâmetros perturbadores na estimação de tamanhos populacionais
In this study, we used the capture-recapture procedure to estimate the size of a closed population. We analysed three di_erent statistics models. For each one of these models we determined - through several methods of eliminating nuisance parameters - the likelihood function and the pro_le, conditional, uniform integrated, Je_reys integrated and generalized
Publicado em: 2010
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22. Survivorship rates of adult Anolis mariarum (Squamata: Polychrotidae) in two populations with differing mean and asymptotic body sizes
We compared adult survivorships in two populations of the lizard Anolis mariarum with different mean and asymptotic body sizes to examine one prediction of age-specific mortality theory; that populations that experience higher adult mortality should exhibit earlier maturation and smaller adult body sizes. We used a maximum likelihood approach to evaluate dif
Papéis Avulsos de Zoologia (São Paulo). Publicado em: 2010
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23. Model selection, estimation and forecasting in VAR models with short-run and long-run restrictions
We study the joint determination of the lag length, the dimension of the cointegrating space and the rank of the matrix of short-run parameters of a vector autoregressive (VAR) model using model selection criteria. We consider model selection criteria which have data-dependent penalties for a lack of parsimony, as well as the traditional ones. We suggest a n
Publicado em: 05/02/2009
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24. Asymptotic properties for a general extremevalue regression model
In this thesis we introduce a general extreme-value regression model and derive Cox and Snellâs (1968) general formulae for second-order biases of maximum likelihood estimates (MLEs) of the parameters. We present formulae which can be computed by means of weighted linear regressions. Furthermore, we give the skewness of order n−1/2 of the MLEs of the
Publicado em: 2009