Robust combination of the Morris and Sobol methods in complex multidimensional models. (December 2019)

• Record Type: Journal Article
• Authors: Garcia, Dorleta; Arostegui, Inmaculada; Prellezo, Raúl
• Is Part Of: Environmental modelling & software. Volume 122(2019)
• Publication Date: 2019-12
• Subjects: AEE absolute elementary effect -- CV coefficient of variation -- GSA global sensitivity analysis -- SSB spawning stock biomass -- TAC total allowable catch; Convergence criterion -- Global sensitivity analysis -- Morris elementary effect method -- Selection criterion -- Sobol variance decomposition method; Environmental monitoring -- Computer programs -- Periodicals; Ecology -- Computer simulation -- Periodicals; Digital computer simulation -- Periodicals; Computer software -- Periodicals; Environmental Monitoring -- Periodicals; Computer Simulation -- Periodicals; Environnement -- Surveillance -- Logiciels -- Périodiques; Écologie -- Simulation, Méthodes de -- Périodiques; Simulation par ordinateur -- Périodiques; Logiciels -- Périodiques; Computer software; Digital computer simulation; Ecology -- Computer simulation; Environmental monitoring -- Computer programs; Periodicals; Electronic journals; 363.70015118
• DOI: 10.1016/j.envsoft.2019.104517
• Languages: English
• ISSNs: 1364-8152

Abstract

Abstract: Conducting global sensitivity analysis using variance decomposition methods in complex simulation models with many input factors is usually unaffordable. An alternative is to first apply a screening method to reduce the number of input factors and then apply a variance decomposition method to the reduced model. However, usually selection of input factors is not done robustly and convergence of the screening method is not ensured. We propose two new criteria, a criterion that mimics the visual selection of the input factors and a convergence criterion. In the application of the criteria to a complex model, the Morris screening method has needed 200 trajectories to converge and the visual criterion has outperformed other existing criteria. Our proposal ensures a robust combination of the Morris and the Sobol methods that provides an objective and automatic method to select the most important input factors with a feasible computing load to achieve convergence. Highlights: New selection criterion for the Morris method applied to multivariate output models. New convergence criterion for the Morris method. The two criteria ensure a robust combination of the Morris and Sobol methods. The new selection criterion outperforms other selection criteria.