Exact risk improvement of bandwidth selectors for kernel density estimation with directional data

E García–Portugués - 2013 - projecteuclid.org
New bandwidth selectors for kernel density estimation with directional data are presented in
this work. These selectors are based on asymptotic and exact error expressions for the …

On the limiting behaviour of needlets polyspectra

V Cammarota, D Marinucci - Annales de l'IHP Probabilités et …, 2015 - numdam.org
This paper provides quantitative Central Limit Theorems for nonlinear transforms of
spherical random fields, in the high-frequency limit. The sequences of fields that we consider …

Estimation of the covariance function of Gaussian isotropic random fields on spheres, related Rosenblatt-type distributions and the cosmic variance problem

NN Leonenko, MS Taqqu, GH Terdik - 2018 - projecteuclid.org
We consider the problem of estimating the covariance function of an isotropic Gaussian
stochastic field on the unit sphere using a single observation at each point of the discretized …

LASSO estimation for spherical autoregressive processes

A Caponera, C Durastanti, A Vidotto - Stochastic Processes and their …, 2021 - Elsevier
The purpose of the present paper is to investigate a class of spherical functional
autoregressive processes in order to introduce and study LASSO (Least Absolute Shrinkage …

Flexible-bandwidth needlets

C Durastanti, D Marinucci, AP Todino - Bernoulli, 2024 - projecteuclid.org
We investigate here a generalized construction of spherical wavelets/needlets which admits
extra-flexibility in the harmonic space, ie, it allows the corresponding support in multipole …

On normal approximations for the two-sample problem on multidimensional tori

S Bourguin, C Durastanti - Journal of Statistical Planning and Inference, 2018 - Elsevier
In this paper, quantitative central limit theorems for U-statistics on the q-dimensional torus
defined in the framework of the two-sample problem for Poisson processes are derived. In …

Quantitative central limit theorems for Mexican needlet coefficients on circular Poisson fields

C Durastanti - Statistical Methods & Applications, 2016 - Springer
The aim of this paper is to establish rates of convergence to Gaussianity for wavelet
coefficients on circular Poisson random fields. This result is established by using the Stein …

Block thresholding on the sphere

C Durastanti - Sankhya A, 2015 - Springer
The aim of this paper is to study nonparametric regression estimators on the sphere based
on needlet block thresholding. The block thresholding procedure proposed here follows the …

Parametric estimation for functional autoregressive processes on the sphere

A Caponera, C Durastanti - Theory of Probability and Mathematical …, 2022 - ams.org
The aim of this paper is to define a nonlinear least squares estimator for the spectral
parameters of a spherical autoregressive process of order 1 in a parametric setting …

Nonparametric needlet estimation for partial derivatives of a probability density function on the d-torus

C Durastanti, N Turchi - Journal of Nonparametric Statistics, 2023 - Taylor & Francis
This paper is concerned with the estimation of the partial derivatives of a probability density
function of directional data on the d-dimensional torus within the local thresholding …