In order to evaluate the distribution of the coefficient of variation (CV) in swine rearing exper... more In order to evaluate the distribution of the coefficient of variation (CV) in swine rearing experiments, scientific papers were examined to search for CV values of each response variable studied. The values found were tabulated by variable and normality was tested using a SAS program, according to Garcia (1989). The limits of intervals were proposed using the mean and the
Brody, Gompertz and Logistic models applied to growth data in Holstein heifers were evaluated. Th... more Brody, Gompertz and Logistic models applied to growth data in Holstein heifers were evaluated. The age-weight data for this study were came from 65 Holstein heifers daughters of 20 bulls. The parameters were estimated by the generalized least squares met hod using nonlinear regression models with autocorrelated errors. Models were compared by using some indicators of goodness of fit and
RESUMO O experimento foi conduzido em área do Departamento de Zootecnia da Universidade Federal d... more RESUMO O experimento foi conduzido em área do Departamento de Zootecnia da Universidade Federal de Lavras, de novembro do 2000 a maio de 2001, com o objetivo de avaliar a performance de três cultivares do gênero Cynodon em quatro idades de corte ( ...
ABSTRACT One of the main subjects studied by population genetics is the Hardy-Weinberg equilibriu... more ABSTRACT One of the main subjects studied by population genetics is the Hardy-Weinberg equilibrium. In this context, this paper addresses the analysis and comparison of bayesian models used in its evaluation by the coefficient of disequilibrium. For this, it was carried out a simulation study in which the following prior distributions were considered: Dirichlet (model 1), beta - uniform step function (model 2), uniform - uniform step function (model 3) and independent uniform priors (model 4). Examples of application to real data for racial groups are presented and discussed. Samples from the marginal posterior distributions for parameters of interest were obtained by Metropolis-Hastings algorithm, which was implemented in the software R. The convergence of the chains generated by this algorithm was monitored by criteria of Geweke and Gelman & Rubin, which are implemented in the BOA package R. Regarding comparisons between models, performed using the Bayes factor, it was observed that model 4 is the most suitable for the cases of DA=0.146, DA=0.02 and DA=-0.02 with n=200, the model 2 is the most suitable for DA=-0.02 with n=50 and the model 3 is the most suitable for DA=-0.02 and n=1000. For real data, in each case examined, there is a large difference in choice of models, where model 1 is the only one not recommended.
Page 1. PROPRIEDADES DO ESTIMADOR DO COEFICIENTE DE COANCESTRIA COM DADOS DE FREQÜÊNCIAS ALÉLICAS... more Page 1. PROPRIEDADES DO ESTIMADOR DO COEFICIENTE DE COANCESTRIA COM DADOS DE FREQÜÊNCIAS ALÉLICAS EM POPULAÇÕES HAPLÓIDES JOEL AUGUSTO MUNIZ 1 SILVIO CÉSAR SARTORI ITO 2 RUBEN ...
The purpose of this work was to present a procedure suitable for analysis of split plot experimen... more The purpose of this work was to present a procedure suitable for analysis of split plot experiments, when the factors under study are quantitative, by means of response surface methodology, where developing the sequence of operations for the acchievement of the statistical analyses and to justify the application of appropriate tests were intended. The conclusions obtained were: the linear model
The aim of this study is to evaluate the behavior of the parameters of the degradation model prop... more The aim of this study is to evaluate the behavior of the parameters of the degradation model proposed by Mertens & Loften (1980) fitted to the results of a rehearsal of degradability in situ. In the experiment, we evaluate the potentially degradable residue of neutral detergent fiber (NDF) of coastcross grass ( Cynodon dactylon x Cynodon nlemfunensis ) cut at
Historical maximum rainfall data are used to forecast extreme rainfall, which is important to ela... more Historical maximum rainfall data are used to forecast extreme rainfall, which is important to elaborate agricultural and hydraulic engineering projects. Generalized Extreme Value Distribution (GEV) has been applied in such type of studies. Since those values are extracted from the upper (or lower) tail of the original distribution, a scarce amount of data is obtained in most cases, which may
In order to evaluate the distribution of the coefficient of variation (CV) in swine rearing exper... more In order to evaluate the distribution of the coefficient of variation (CV) in swine rearing experiments, scientific papers were examined to search for CV values of each response variable studied. The values found were tabulated by variable and normality was tested using a SAS program, according to Garcia (1989). The limits of intervals were proposed using the mean and the
Brody, Gompertz and Logistic models applied to growth data in Holstein heifers were evaluated. Th... more Brody, Gompertz and Logistic models applied to growth data in Holstein heifers were evaluated. The age-weight data for this study were came from 65 Holstein heifers daughters of 20 bulls. The parameters were estimated by the generalized least squares met hod using nonlinear regression models with autocorrelated errors. Models were compared by using some indicators of goodness of fit and
RESUMO O experimento foi conduzido em área do Departamento de Zootecnia da Universidade Federal d... more RESUMO O experimento foi conduzido em área do Departamento de Zootecnia da Universidade Federal de Lavras, de novembro do 2000 a maio de 2001, com o objetivo de avaliar a performance de três cultivares do gênero Cynodon em quatro idades de corte ( ...
ABSTRACT One of the main subjects studied by population genetics is the Hardy-Weinberg equilibriu... more ABSTRACT One of the main subjects studied by population genetics is the Hardy-Weinberg equilibrium. In this context, this paper addresses the analysis and comparison of bayesian models used in its evaluation by the coefficient of disequilibrium. For this, it was carried out a simulation study in which the following prior distributions were considered: Dirichlet (model 1), beta - uniform step function (model 2), uniform - uniform step function (model 3) and independent uniform priors (model 4). Examples of application to real data for racial groups are presented and discussed. Samples from the marginal posterior distributions for parameters of interest were obtained by Metropolis-Hastings algorithm, which was implemented in the software R. The convergence of the chains generated by this algorithm was monitored by criteria of Geweke and Gelman & Rubin, which are implemented in the BOA package R. Regarding comparisons between models, performed using the Bayes factor, it was observed that model 4 is the most suitable for the cases of DA=0.146, DA=0.02 and DA=-0.02 with n=200, the model 2 is the most suitable for DA=-0.02 with n=50 and the model 3 is the most suitable for DA=-0.02 and n=1000. For real data, in each case examined, there is a large difference in choice of models, where model 1 is the only one not recommended.
Page 1. PROPRIEDADES DO ESTIMADOR DO COEFICIENTE DE COANCESTRIA COM DADOS DE FREQÜÊNCIAS ALÉLICAS... more Page 1. PROPRIEDADES DO ESTIMADOR DO COEFICIENTE DE COANCESTRIA COM DADOS DE FREQÜÊNCIAS ALÉLICAS EM POPULAÇÕES HAPLÓIDES JOEL AUGUSTO MUNIZ 1 SILVIO CÉSAR SARTORI ITO 2 RUBEN ...
The purpose of this work was to present a procedure suitable for analysis of split plot experimen... more The purpose of this work was to present a procedure suitable for analysis of split plot experiments, when the factors under study are quantitative, by means of response surface methodology, where developing the sequence of operations for the acchievement of the statistical analyses and to justify the application of appropriate tests were intended. The conclusions obtained were: the linear model
The aim of this study is to evaluate the behavior of the parameters of the degradation model prop... more The aim of this study is to evaluate the behavior of the parameters of the degradation model proposed by Mertens & Loften (1980) fitted to the results of a rehearsal of degradability in situ. In the experiment, we evaluate the potentially degradable residue of neutral detergent fiber (NDF) of coastcross grass ( Cynodon dactylon x Cynodon nlemfunensis ) cut at
Historical maximum rainfall data are used to forecast extreme rainfall, which is important to ela... more Historical maximum rainfall data are used to forecast extreme rainfall, which is important to elaborate agricultural and hydraulic engineering projects. Generalized Extreme Value Distribution (GEV) has been applied in such type of studies. Since those values are extracted from the upper (or lower) tail of the original distribution, a scarce amount of data is obtained in most cases, which may
Uploads
Papers by Joel Muniz