Results 21 to 30 of about 12,807,756 (320)

Means and covariance functions for geostatistical compositional data: an axiomatic approach [PDF]

, 2017
This work focuses on the characterization of the central tendency of a sample of compositional data. It provides new results about theoretical properties of means and covariance functions for compositional data, with an axiomatic perspective.
A Kolmogorov, D Billheimer, Denis Allard, DJJ Walvoort, G Mateu-Figueras, H Wackernagel, J Aczél, J Aczél, J Aitchison, J Aitchison, J Aitchison, J Matkowski, JD Helterbrand, JJ Egozcue, JJ Egozcue, JL Scealy, JP Chilès, KL Arrow, N Cressie, P Bogaert, R Tolosana-Delgado, RF Shurtz, RY Liu, Thierry Marchant, V Pawlowksy-Glahn, V Pawlowksy-Glahn, WE Miller, WE Sharp, Y Vardi, Y Zuo   +29 more
core   +3 more sources

Analysis of code levelling rods calibration accuracy applying covariance functions

Geodesy and Cartography, 2012
An analysis of code levelling rods calibration accuracy applying covariance functions theory is presented. Images of the coded rods are treated by the Matlab 7 computer program.
Jonas Skeivalas, Eimuntas Paršeliūnas, Raimundas Putrimas, Dominykas Šlikas   +3 more
doaj   +1 more source

Asymptotic normality of the residual correlogram in the continuous-time nonlinear regression model

Modern Stochastics: Theory and Applications, 2020
In a continuous time nonlinear regression model the residual correlogram is considered as an estimator of the stationary Gaussian random noise covariance function.
Alexander Ivanov, Kateryna Moskvychova
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

Physical properties of the Schur complement of local covariance matrices [PDF]

, 2007
General properties of global covariance matrices representing bipartite Gaussian states can be decomposed into properties of local covariance matrices and their Schur complements. We demonstrate that given a bipartite Gaussian state $\rho_{12}$ described
Eisert J Wolf M M, Horn R A, Kraus K, L F Haruna, M C de Oliveira, Ozorio de Almeida A M, Ozorio de Almeida A M, Ozorio de Almeida A M   +7 more
core   +2 more sources

On Time Correlations for KPZ Growth in One Dimension [PDF]

, 2016
Time correlations for KPZ growth in 1+1 dimensions are reconsidered. We discuss flat, curved, and stationary initial conditions and are interested in the covariance of the height as a function of time at a fixed point on the substrate.
Ferrari, Patrik L., Spohn, Herbert
core   +1 more source

Analysis of Dynamic Parameters of a Railway Bridge

Applied Sciences, 2019
This article analyses the dispersion of vibration accelerations of a railway bridge during the passage of a train, and presents an analysis of their parameters after the application of the theory of covariance functions.
Artūras Kilikevičius, Jonas Skeivalas, Kristina Kilikevičienė, Jonas Matijošius   +3 more
doaj   +1 more source

Large covariance matrices: smooth models from the two-point correlation function [PDF]

, 2015
We introduce a new method for estimating the covariance matrix for the galaxy correlation function in surveys of large-scale structure. Our method combines simple theoretical results with a realistic characterization of the survey to dramatically reduce ...
R. O’Connell, D. Eisenstein, Mariana Vargas, S. Ho, N. Padmanabhan   +4 more
semanticscholar   +1 more source

Predição de valores genéticos para a produção de leite no dia do controle e para a produção acumulada até 305 dias Predicting breeding values for test-day records and accumulated 305 day milk yield

Revista Brasileira de Zootecnia, 2005
Foram estimados valores genéticos para as produções de leite no dia do controle de animais da raça Caracu, usando modelo unicaracterístico padrão (TDMO) e modelo de regressão aleatória (MRA).
Lenira El Faro, Lucia Galvão de Albuquerque   +1 more
doaj   +1 more source

New Closed Form Estimators for the Beta Distribution

Mathematics, 2023
In this paper, we detail closed form estimators for beta distribution that are simpler than those proposed by Tamae, Irie and Kubokawa. The proposed estimators are shown to have smaller asymptotic variances and smaller asymptotic covariances compared to ...
Victor Mooto Nawa, Saralees Nadarajah
doaj   +1 more source