Robust combination of the Morris and Sobol methods in complex multidimensional models
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.