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A bivariate generalized exponential distribution derived from copula functions in the presence of censored data and covariates
(2015-01-01)
In this paper, we introduce a Bayesian analysis for a bivariate generalized exponential distribution in the presence of censored data and covariates derived from Copula functions. The generalized exponential distribution ...
Stein hypothesis and screening effect for covariances with compact support
(Inst Mathematical Statistics, 2020)
In spatial statistics, the screening effect historically refers to the situation when the observations located far from the predict and receive a small (ideally, zero) kriging weight. Several factors play a crucial role ...
On a multivariate generalization of the covariance
(Taylor & FrancisGIFI - Grupo de Investigación en Finanzas de la UdeA, 2022)
Operator ordering for generally covariant systems
(North-holland, 2000-12)
The constriant operators belonging to a generally covariant system are found out within the framework of the BRST formalism. The result embraces quadratic Hamiltonian constraints whose potential can factorized as a never ...
Simulation of intrinsic random fields of order k with a continuous spectral algorithm
(Springer New York LLC, 2018)
Intrinsic random fields of order k, defined as random fields whose high-order increments (generalized increments of order
k) are second-order stationary, are used in spatial statistics to model regionalized variables ...
A modified Covariance Matrix Adaptation Evolution Strategy with adaptive penalty function and restart for constrained optimization
(Elsevier B.V., 2014-11-15)
In the last decades, a number of novel meta-heuristics and hybrid algorithms have been proposed to solve a great variety of optimization problems. Among these, constrained optimization problems are considered of particular ...
Variance component estimates applying random regression models for test-day milk yield in Caracu heifers (Bos taurus Artiodactyla, Bovidae)
(Sociedade Brasileira de Genética, 2008-01-01)
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 ...
Multiradial matrix covariance functions: characterization and applications
(2014)
All results presented here concern to radial (isotropic) and multiradial (danisotropic) matrix-valued covariance functions. We specify some important properties of matrix-valued covariance functions associated to ...
Simulation of Intrinsic Random Fields of Order k with Gaussian Generalized Increments by Gibbs Sampling
(Springer, 2015)
This work pertains to the simulation of an intrinsic random field of order k
with a given generalized covariance function and multivariate Gaussian generalized
increments. An iterative algorithm based on the Gibbs sampler ...
Variance component estimates applying random regression models for test-day milk yield in Caracu heifers (Bos taurus Artiodactyla, Bovidae)
(Sociedade Brasileira de Genética, 2014)