Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/36886
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Type: Journal article
Title: VARIOG2D: a computer program for estimating the semi-variogram and its uncertainty
Author: Pardo-Iguzquiza, E.
Dowd, P.
Citation: Computers & Geosciences, 2001; 27(5):549-561
Publisher: Pergamon-Elsevier Science Ltd
Issue Date: 2001
ISSN: 0098-3004
Statement of
Responsibility: 
Eulogio Pardo-Igúzquiza and Peter A. Dowd
Abstract: VARIOG2D is a Fortran-77 program that provides four basic operations for semi-variogram analysis: inference of the experimental semi-variogram, estimation of the variance–covariance matrix of the experimental semi-variogram, fitting a theoretical model by non-linear generalised least squares and estimation of the uncertainty of the semi-variogram model parameters. Although software for estimating the semi-variogram by the method of moments is widely available, there is no generally available software for assessing the uncertainty of the experimental semi-variogram. VARIOG2D provides the exact variance–covariance matrix of the experimental semi-variogram, which can be used for attaching standard errors to the experimental semi-variogram, for assessing the correlation between the different semi-variogram lag estimates and for fitting a model by generalised least squares. In addition, the generalised least-squares fitting procedure allows an evaluation of the uncertainty of the experimental semi-variogram and of the semi-variogram model parameters. A case study shows the application of the variance–covariance matrix of the experimental semi-variogram and the performance and capabilities of the program.
Keywords: Geostatistics; Variance–covariance matrix; Standard error; Generalised least squares; Soil science
Description: Copyright © 2001 Published by Elsevier Science
RMID: 0020065731
DOI: 10.1016/S0098-3004(00)00165-5
Description (link): http://www.sciencedirect.com/science/journal/00983004
Appears in Collections:Civil and Environmental Engineering publications

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