Results 11 to 20 of about 489,537 (279)

Estimation of covariance functions for spatio-temporal data

Lietuvos Matematikos Rinkinys, 2003
There is not abstract.
Edita Lesauskienė, Kęstutis Dučinskas
doaj   +3 more sources

Estimativas de parâmetros genéticos para produção de leite e persistência da lactação em vacas Gir, aplicando modelos de regressão aleatória Estimates of genetic parameters for milk yield and persistency of lactation of Gyr cows, applying random regression models

Revista Brasileira de Zootecnia, 2008
Com o objetivo de estimar parâmetros genéticos para a produção de leite no dia do controle (PLDC), foram usadas as 2.440 primeiras lactações de vacas da raça Gir leiteira, com partos registrados entre 1990 e 2005.
Luis Gabriel González Herrera, Lenira El Faro, Lucia Galvão de Albuquerque, Tonhati Humberto, Carlos Henrique Cavallari Machado   +4 more
doaj   +1 more source

Variance component estimates applying random regression models for test-day milk yield in Caracu heifers (Bos taurus Artiodactyla, Bovidae)

Genetics and Molecular Biology, 2008
Random regression models (RRM) were used to estimate covariance functions for 2,155 first-lactation milk yields of native Brazilian Caracu heifers. The models included contemporary group (defined as year-month of test and paddock) fixed effects, and ...
Lenira El Faro, Vera Lucia Cardoso, Lucia Galvão de Albuquerque   +2 more
doaj   +1 more source

A Generic Approach to Covariance Function Estimation Using ARMA-Models

Mathematics, 2020
Covariance function modeling is an essential part of stochastic methodology. Many processes in geodetic applications have rather complex, often oscillating covariance functions, where it is difficult to find corresponding analytical functions for ...
Till Schubert, Johannes Korte, Jan Martin Brockmann, Wolf-Dieter Schuh   +3 more
doaj   +1 more source

Note on AR(1)-characterisation of stationary processes and model fitting

Modern Stochastics: Theory and Applications, 2019
It was recently proved that any strictly stationary stochastic process can be viewed as an autoregressive process of order one with coloured noise. Furthermore, it was proved that, using this characterisation, one can define closed form estimators for ...
Marko Voutilainen, Lauri Viitasaari, Pauliina Ilmonen   +2 more
doaj   +1 more source

Discriminant Functions with Covariance

The Annals of Mathematical Statistics, 1948
This paper discusses the extension of the discriminant function to the case where certain variates (called the covariance variates) are known to have the same means in all populations. Although such variates have no discriminating power by themselves, they may still be utilized in the discriminant function.
Cochran, W. G., Bliss, C. I.
openaire   +2 more sources

Discriminant analysis of Gaussian spatial data with exponential covariance structure

Lietuvos Matematikos Rinkinys, 2005
This paper considers the discrimination of the observation of the stationary Gaussian random field belonging to one of two populations with different means and covariance functions.
Kęstutis Dučinskas
doaj   +3 more sources

Gaussian Processes for Vegetation Parameter Estimation from Hyperspectral Data with Limited Ground Truth

Remote Sensing, 2019
An important application of airborne- and satellite-based hyperspectral imaging is the mapping of the spatial distribution of vegetation biophysical and biochemical parameters in an environment.
Utsav B. Gewali, Sildomar T. Monteiro, Eli Saber   +2 more
doaj   +1 more source

Dias ao Parto de Fêmeas Nelore de um Experimento de Seleção para Crescimento: II - Modelo de Regressão Aleatória Days to Calving of Nelore Cows from a Selection Experiment for Growth: II - Random Regression Model

Revista Brasileira de Zootecnia, 2002
Os parâmetros genéticos para dias ao parto foram estimados usando um modelo de regressão aleatória, com polinômios ortogonais da idade na monta (em anos) como covariável.
Maria Eugênia Zerlotti Mercadante, Irineu Umberto Packer, Alexander George Razook, Claudio Manoel Rodrigues de Melo, Joslaine Noely dos Santos Gonçalves Cyrillo, Leopoldo Andrade de Figueiredo   +5 more
doaj   +1 more source

Estimates of direct and maternal covariance functions for growth of Australian beef calves from birth to weaning

Genetics Selection Evolution, 2001
Records for birth and subsequent, monthly weights until weaning on beef calves of two breeds in a selection experiment were analysed fitting random regression models. Independent variables were orthogonal (Legendre) polynomials of age at weighing in days.
Meyer Karin
doaj   +1 more source