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Type: Journal article
Title: A generalised approach for identifying influential data in hydrological modelling
Author: Wright, D.
Thyer, M.
Westra, S.
Renard, B.
McInerney, D.
Citation: Environmental Modelling and Software, 2019; 111:231-247
Publisher: Elsevier
Issue Date: 2019
ISSN: 1364-8152
Statement of
David P. Wright, Mark Thyer, Seth Westra, Benjamin Renard, David McInerney
Abstract: Influence diagnostics are used to identify data points that have a disproportionate impact on model parameters, performance and/or predictions, providing valuable information for use in model calibration. Regression-theory influence diagnostics identify influential data by combining the leverage and the standardised residuals, and are computationally more efficient than case-deletion approaches. This study evaluates the performance of a range of regression-theory influence diagnostics on ten case studies with a variety of model structures and inference scenarios including: nonlinear model response, heteroscedastic residual errors, data uncertainty and Bayesian priors. A new technique is developed, generalised Cook's distance, that is able to accurately identify the same influential data as standard case deletion approaches (Spearman rank correlation: 0.93–1.00) at a fraction of the computational cost (<1%). This is because generalised Cook's distance uses a generalised leverage formulation which outperforms linear and nonlinear leverage formulations because it has less restrictive assumptions. Generalised Cook's distance has the potential to enable influential data to be efficiently identified on a wide variety of hydrological and environmental modelling problems.
Keywords: Hydrologic model calibration; Influence diagnostics; Cook's distance; Generalised leverage
Description: Available online 22 June 2018
Rights: © 2018 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.envsoft.2018.03.004
Appears in Collections:Aurora harvest 8
Civil and Environmental Engineering publications

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