Consulta: subjectFacets:"Bayesian Inference"
Registros recuperados: 5
Data/hora: 09/06/2024 06:35:36

Phylogeography of Hypostomus strigaticeps(Siluriformes: Loricariidae) inferred by mitochondrial DNA reveals its distribution in the upper Paraná River basin
Provedor de dados: Neotropical Ichthyology
Autores: Borba,Rafael Splendore de; Zawadzki,Claudio Henrique; Oliveira,Claudio; Perdices,Anabel; Parise-Maltempi,Patrícia Pasquali; Alves,Anderson Luis.
In this study, phylogenetic and phylogeographic analyses of populations identified as Hypostomus strigaticeps from the upper Paraná River basin were conducted in order to test whether these different populations comprises cryptic species or structured populations and to assess their genetic variability. The sequences of the mitochondrial DNA ATP sintetase (subunits 6/8) of 27 specimens from 10 populations (one from Mogi-Guaçu River, five from Paranapanema River, three from Tietê River and one from Peixe River) were analyzed. The phylogeographic analysis showed the existence of eight haplotypes (A-H), and despite the ancestral haplotype includes only individuals from the Tietê River basin, the distribution of H. strigaticeps was not restricted to this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ATPase; Bayesian Inference; Haplotype; Nested clade; Phylogeny.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100111

Trip-Level Analysis of Efficiency Changes in Oregon's Deepwater Trawl Fishery
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Tomberlin,   David; Holloway,   Garth J.
In 2003, an industry-financed, government-administered buyback of trawl fishing permits and vessels took place on the US West Coast, resulting in the retirement of about one-third of the limited-entry trawl fleet. The lack of cost data in this fishery precludes an analysis of how the buyback has affected profitability, but changes in technical efficiency can provide some insight into the program's effects. This paper, the first of a planned series of analyses of the buyback's effect on technical efficiency in the trawl fleet, applies stochastic frontier analysis to assess whether technical efficiency changed perceptibly after 2003. We adopt a hierarchical modeling approach estimated with Markov Chain Monte Carlo methods, and present results from both...
Tipo: Working or Discussion Paper
Palavras-chave: Fishery Buyback; Technical Efficiency; Stochastic Production Frontier; Bayesian Inference; Markov Chain Monte Carlo; Resource /Energy Economics and Policy; Q2; L5; C1.
Ano: 2007
URL: http://purl.umn.edu/8223

A Bayesian Total Factor Productivity Analysis of Tropical Agricultural Systems in Central-Western Africa And South-East Asia
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Tonini,   Axel; Matus,   Silvia Saravia; Gomez y Paloma,   Sergio.
This paper computes and analyses total factor productivity (TFP) growth rates for tropical agricultural systems in Central-Western Africa and South-East Asia. Two regions that despite sharing common agro-ecological conditions, have pursued different adoption rates of green revolution technology and have reported dissimilar yields per hectare. A panel data set is constructed for the period 1987-2007 from the FAOSTAT database. A Bayesian stochastic frontier model with country specific temporal variation in technical efficiency is estimated. Technical efficiency estimates reveal that there is substantial room for improvement in both continental sub-sets and that TFP estimates show on average larger rates of growth for South-East Asian countries as compared to...
Tipo: Conference Paper or Presentation
Palavras-chave: Bayesian Inference; Stochastic Production Frontier; Time Varying Technical Inefficiency; Total Factor Productivity Growth; Tropical Agricultural Systems; Farm Management; Productivity Analysis; C15; D24; O47.
Ano: 2011
URL: http://purl.umn.edu/116088

Implications of Missing Data Imputation for Agricultural Household Surveys: An Application to Technology Adoption
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Gedikoglu,   Haluk; Parcell,   Joseph L.
Missing data is a problem that occurs frequently in survey data. Missing data results in biased estimates and reduced efficiency for regression estimates. The objective of the current study is to analyze the impact of missing-data imputation, using multiple-imputation methods, on regression estimates for agricultural household surveys. The current study also analyzes the impact of multiple-imputation on regression results, when all the variables in the regression have missing observations. Finally, the current study compares the impact of univariate multiple imputation with multivariate normal multiple imputation, when some of the missing variables have discrete distribution. The results of the current study show that multivariate-normal multiple...
Tipo: Presentation
Palavras-chave: Missing Data; Multiple Imputation; Bayesian Inference; Household Surveys; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/124333

Genetic parameters in female reproductive traits of Nile tilapia (Oreochromis niloticus)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: YOSHIDA,GRAZYELLA M.; OLIVEIRA,CARLOS A.L. DE; KUNITA,NATALÍ M.; RIZZATO,GABRIEL S.; RIBEIRO,RICARDO P.
ABSTRACT Genetic parameters for reproductive traits in female Nile tilapia were estimated in this study using Bayesian inference method. The data set presented information from 451 Nile tilapia females that were evaluated at two different places in Maringá - Paraná - Brazil (hapas of 1 and 10 m³) and at one location in Alfenas - Minas Gerais - Brazil. A spawning examination was conducted once a week from October 2012 to March 2013 for a total of 23 weeks of evaluation. Single-trait analyses for spawning success, multiple spawning, spawning frequency, and volume of eggs/female were performed by using the software MTGSAM Threshold. The heritability estimates were 0.14, 0.16, 0.53, and 0.08 for spawning success, multiple spawning, spawning frequency and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian Inference; Heritability; Oreochromis niloticus; Repeatability; Spawning.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502515