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SPEPS Preprint

Author(s): Holger Heitsch, Humboldt-University
Hernan Leövey, Humboldt-University
Werner Römisch, Humboldt-University
Title: Are Quasi-Monte Carlo algorithms efficient for two-stage stochastic programs?
Date of Acceptance: 24.09.2012
Submission Date: 01.06.2012
Series Title: Stochastic Programming E-Print Series
(SPEPS)
Editors: Julie L. Higle; Werner Römisch; Surrajeet Sen
Complete Preprint: pdf (urn:nbn:de:kobv:11-100204148)
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Abstract (eng):
Quasi-Monte Carlo algorithms are studied for designing discrete approximations of two-stage linear stochastic programs. Their integrands are piecewise linear, but neither smooth nor lie in the function spaces considered for QMC error analysis. We show that under some weak geometric condition on the two-stage model all terms of their ANOVA decomposition, except the one of highest order, are smooth. Hence, Quasi-Monte Carlo algorithms may achieve the optimal rate of convergence $O(n^{-1+\delta}$ with $\delta \in (0,\frac{1}{2}]$ and a constant not depending on the dimension. The geometric condition is shown to be generically satis fied if the underlying distribution is normal. We discuss sensitivity indices, e ffective dimensions and dimension reduction techniques for two-stage integrands. Numerical experiments show that indeed convergence rates close to the optimal rate are achieved when using randomly scrambled Sobol' point sets and randomly shifted lattice rules accompanied with suitable dimension reduction techniques.
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