Abstract
The Bayesian model evidence can be used for model selection in model updating problems. The evidence is calculated by computing the integral of the prior multiplied by the likelihood probability density functions (PDF). This integral is usually solved numerically using Monte Carlo integration techniques. A large number of samples of the likelihood and prior should be computed to implement such algorithms. This process might not be achievable when the model is computationally expensive. Researchers have proposed the use of metamodels to replace the computationally expensive model to solve this problem. In this paper we propose a different strategy. The evidence integrand is replaced by a metamodel, simplifying the model selection process because the scale parameter of the metamodel approximates the value of the integral and no Monte Carlo integration is needed. The proposed technique is explored using a set of numerical problems.
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Madarshahian, R., Caicedo, J.M. (2016). Metamodeling of Model Evidence. In: Atamturktur, S., Schoenherr, T., Moaveni, B., Papadimitriou, C. (eds) Model Validation and Uncertainty Quantification, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-29754-5_30
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DOI: https://doi.org/10.1007/978-3-319-29754-5_30
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