Troffaes, Matthias C. M. (2018) 'Imprecise Monte Carlo simulation and iterative importance sampling for the estimation of lower previsions.', International journal of approximate reasoning., 101 . pp. 31-48.
We develop a theoretical framework for studying numerical estimation of lower previsions, generally applicable to two-level Monte Carlo methods, importance sampling methods, and a wide range of other sampling methods one might devise. We link consistency of these estimators to Glivenko-Cantelli classes, and for the sub-Gaussian case we show how the correlation structure of this process can be used to bound the bias and prove consistency. We also propose a new upper estimator, which can be used along with the standard lower estimator, in order to provide a simple confidence interval. As a case study of this framework, we then discuss how importance sampling can be exploited to provide accurate numerical estimates of lower previsions. We propose an iterative importance sampling method to drastically improve the performance of imprecise importance sampling. We demonstrate our results on the imprecise Dirichlet model.
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|Publisher Web site:||https://doi.org/10.1016/j.ijar.2018.06.009|
|Publisher statement:||© 2018 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/|
|Record Created:||05 Dec 2017 09:28|
|Last Modified:||06 Jul 2018 09:27|
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