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Admissible nested covariance models over spheres cross time
(Springer New York LLC, 2018)
Nested covariance models, defined as linear combinations of basic covariance functions, are very popular in many branches
of applied statistics, and in particular in geostatistics. A notorious limit of nested models is ...
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 ...
An improved spectral turning-bands algorithm for simulating stationary vector Gaussian random fields
(2016)
We propose a spectral turning-bands approach for the simulation of second-order stationary vector Gaussian random fields. The approach improves existing spectral methods through coupling with importance sampling techniques. ...
On a multivariate generalization of the covariance
(Taylor & FrancisGIFI - Grupo de Investigación en Finanzas de la UdeA, 2022)
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 ...
On a continuous spectral algorithm for simulating non stationary Gaussian random fields
(Springer, 2018)
This paper presents an algorithm for simulating
Gaussian random fields with zero mean and non-stationary
covariance functions. The simulated field is obtained as a
weighted sum of cosine waves with random frequencies
and ...
On a continuous spectral algorithm for simulating non-stationary Gaussian random fields
(Springer New York LLC, 2018)
This paper presents an algorithm for simulating Gaussian random fields with zero mean and non-stationary covariance functions. The simulated field is obtained as a weighted sum of cosine waves with random frequencies and ...
A spectral algorithm to simulate nonstationary random fields on spheres and multifractal star-shaped random sets
(Springer, 2020)
An extension of the turning arcs algorithm is proposed for simulating a random field on the two-dimensional sphere with a second-order dependency structure associated with a locally varying Schoenberg sequence. In particular, ...
A turning bands method for simulating isotropic Gaussian random fields on the sphere
(Elsevier B.V., 2019)
We introduce a novel approach to simulate Gaussian random fields defined over spheres of ℝ3. Through continuation we embed the process on the sphere in a nonstationary random field of ℝ3 to use a turning bands method. We ...
The relation between hairpin formation by mitochondrial WANCY tRNAs and the occurrence of the light strand replication origin in Lepidosauria
(Elsevier, 2014)
Mitochondrial light strand DNA replication is initiated at light strand replication origins (OLs), short stem-loop hairpins formed by the heavy strand DNA. OL-like secondary structures are also formed by heavy strand DNA ...