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PCE emulator and sensitivity indices convergence analysis for the analytical solution – (a) relative error and (b) first-order Sobol indices for each PCE order across 5 runs. (c) Kernel density estimate (KDE) of WSS values for the order 3 emulator. (d) Percent output variance due to unary (single parameter), binary (pairwise), and tertiary (triplewise) interactions for order 3 PCE analysis.
