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Estimation of distributions via multilevel Monte Carlo with stratified sampling

Journal Article · · Journal of Computational Physics
 [1];  [2]
  1. Stanford Univ., CA (United States). Dept. of Energy Resources Engineering; Stanford Univ., CA (United States)
  2. Stanford Univ., CA (United States). Dept. of Energy Resources Engineering

We design and implement a novel algorithm for computing a multilevel Monte Carlo (MLMC) estimator of the joint cumulative distribution function (CDF) of a vector-valued quantity of interest in problems with random input parameters and initial conditions. Our approach combines MLMC with stratified sampling of the input sample space by replacing standard Monte Carlo at each level with stratified Monte Carlo initialized with proportionally allocated samples. We show that the resulting stratified MLMC (sMLMC) algorithm is more efficient than its standard MLMC counterpart due to the additional variance reduction provided by the stratification of the random parameter's domain, especially at the coarsest levels. Additional computational cost savings are obtained by smoothing the indicator function with a Gaussian kernel, which proves to be an efficient and robust alternative to recently developed polynomial-based techniques.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Defense Advanced Research Project Agency (DARPA); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
SC0019130
OSTI ID:
1852855
Alternate ID(s):
OSTI ID: 1638394
Journal Information:
Journal of Computational Physics, Journal Name: Journal of Computational Physics Journal Issue: C Vol. 419; ISSN 0021-9991
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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