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Hierarchical emulation : a method for modeling and comparing nested simulators.

Oughton, Rachel H. and Craig, Peter S. (2016) 'Hierarchical emulation : a method for modeling and comparing nested simulators.', SIAM/ASA journal on uncertainty quantification., 4 (1). pp. 495-519.


Computer simulators often contain options to include extensions, leading to different versions of a particular simulator with slightly different input spaces. We develop hierarchical emulation, a method for emulating such simulators and for learning about the differences between versions of a simulator. In an example using data from an ocean carbon cycle model, hierarchical emulators outperformed standard emulators both in their predictive accuracy and their coherence with the emulation model. The hierarchical emulator performed particularly well when a comparatively small amount of training data came from the extended simulator. This benefit of hierarchical emulation is advantageous when the extended simulator is costly to run compared to the simpler version.

Item Type:Article
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Publisher statement:© 2016, Society for Industrial and Applied Mathematics
Date accepted:19 January 2016
Date deposited:19 February 2016
Date of first online publication:03 May 2016
Date first made open access:19 May 2016

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