Hector Andres Araya

Hector Andres Araya
Universidad Adolfo Ibáñez · Facultad de Ingeniería y Ciencias

PhD

About

21
Publications
1,409
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32
Citations
Citations since 2017
21 Research Items
32 Citations
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012

Publications

Publications (21)
Article
This article studies the monthly variability of anchovy (Engraulis ringens) in northern Chile, related with the environmental effect of sea surface temperature on the landings of the fishery. In order to achieve that goal, a variant of the autoregressive conditional heteroskedastic (ARCH) model is proposed, in which an additional covariate is inclu...
Preprint
Full-text available
In this work, we introduce a new process by modifying the kernel in the time domain representation of the generalized Hermite process. This modification is constructed by means of multiplication of the kernel in the time definition of the process by an exponential tempering factor {\lambda} > 0 such that this new process is well defined. Several pr...
Preprint
In this article, we propose an Euler type scheme to approximate the solutions of stochastic differential equations with non-lipschitz diffusion coefficient driven by fractional Brownian motion (fBm) with Hurst parameter 1/2 < H < 1. Using fractional calculus tools and pathwise integration respect to fBm, the obtained rate of convergence is n^α(1−2H...
Article
Full-text available
This paper deals with the problem of parameter estimation in a class of stochastic differential equations driven by a fractional Brownian motion with H≥1/2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsi...
Article
In this article, we study the parametric problem of estimating the coefficient for a discrete time model driven by a fractional Poisson noise, when high-frequency observations are given. We consider weighted least squares and maximum likelihood estimators. Thus, asymptotic behavior of the estimators is proved and a simulation study is shown to illu...
Article
Full-text available
In this paper, we study Hermite spatial variations for the solution to the stochastic heat equation with space-time white noise. We prove that these variations satisfy the central limit theorem and we obtain the almost sure central limit theorem
Article
In this article, we introduce a non Gaussian long memory process constructed by the aggregation of independent copies of a fractional Lévy Ornstein-Uhlenbeck process with random coefficients. Several properties and a limit theorem are studied for this new process. Finally, some simulations of the limit process are shown.
Preprint
Full-text available
In this article, we introduce a non Gaussian long memory process constructed by the aggregation of independent copies of a fractional L\'evy Ornstein-Uhlenbeck process with random coefficients. Several properties and a limit theorem are studied for this new process. Finally, some simulations of the limit process are shown.
Article
Full-text available
Whale-watching (WW) is an activity which has been increasing worldwide due to the great interest of tourists and the economic benefits it provides to local communities. However, it has been reported that this activity affects the behavioral patterns of some cetaceans, although for some species such as the fin whale (Balaenoptera physalus) this has...
Article
Full-text available
Whale-watching (WW) is an activity which has been increasing worldwide due to the great interest of tourists and the economic benefits it provides to local communities. However, it has been reported that this activity affects the behavioral patterns of some cetaceans, although for some species such as the fin whale (Balaenoptera physalus) this has...
Article
We propose a local linearization scheme to approximate the solutions of non-autonomous stochastic differential equations driven by fractional Brownian motion with Hurst parameter 1/2<H<1. Toward this end, we approximate the drift and diffusion terms by means of a first-order Taylor expansion. This becomes the original equation into a local fraction...
Article
We consider the sequence of spatial quadratic variations of the solution to the stochastic heat equation with space-time white noise. This sequence satisfies a Central Limit Theorem. By using Malliavin calculus, we refine this result by proving the convergence of the sequence of densities and by finding the second-order term in the asymptotic expan...
Article
In this short note, we give the representation of the non symmetric Rosenblatt process as a Wiener–Itô multiple integral with respect to the Brownian motion on a finite interval. Based on this representation, we obtain a least square-type estimator for an unknown parameter of the drift coefficient of a simple model driven by the non symmetric Rosen...
Article
In this article, we study a numerical scheme for stochastic differential equations driven by fractional Brownian motion with Hurst parameter H ∈ (1/4, 1/2). Towards this end, we apply Doss-Sussmann representation of the solution and an approximation of this representation using a first order Taylor expansion. The obtained rate of convergence is n^(...
Article
In this work we present a group of theoretical models for reaction times arising from simple-choice task tests. In particular, we argue for the inclusion of a shifted version of the Gamma distribution as a theoretical model based on a mathematical result on first hitting times. We contrast the goodness-of-fit of those models with the Ex-Gaussian di...
Preprint
Full-text available
In this article, we study a numerical scheme for stochastic differential equations driven by fractional Brownian motion with Hurst parameter H in (1/4; 1/2). Towards this end, we apply Doss-Sussmann representation of the solution and an approximation of this representation using a first order Taylor expansion. The obtained rate of convergence is n^...
Preprint
In this article, we present the least squares estimator for the drift parameter in a linear regression model driven by the increment of a fractional Brownian motion sampled at random times. For two different random times, Jittered and renewal process sampling, consistency of the estimator is proven. A simulation study is provided to illustrate the...
Preprint
In this article, we present the least squares estimator for the drift parameter in a linear regression model driven by the increment of a fractional Brownian motion sampled at random times. For two different random times, Jittered and renewal process sampling, consistency of the estimator is proven. A simulation study is provided to illustrate the...
Article
In this paper we study a Donsker type theorem for the fractional Poisson process (fPp). We present the random walk discretization and its associated convergence theorem in the Skorohod topology. Simulation results are also presented.
Article
We consider a d-parameter Hermite process with Hurst index [Formula presented] and we study its limit behavior in distribution when the Hurst parameters Hi,i=1,.,d (or a part of them) converge to [Formula presented] and/or 1. The limit obtained is Gaussian (when at least one parameter tends to [Formula presented] and non-Gaussian (when at least one...
Article
Full-text available
In this article, we study the problem of parameter estimation for a discrete Ornstein - Uhlenbeck model driven by Poisson fractional noise. Based on random walk approximation for the noise, we study least squares and maximum likelihood estimators. Thus, asymptotic behaviours of the estimator is carried out, and a simulation study is shown to illust...

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