Monte Carlo bounding techniques for determining solution quality in stochastic programs

  • Authors:
  • Wai-Kei Mak;David P. Morton;R.Kevin Wood

  • Affiliations:
  • Department of Computer Science, The University of Texas at Austin, Austin, TX 78712, USA;Graduate Program in Operations Research, The University of Texas at Austin, Austin, TX 78712, USA;Operations Research Department, Naval Postgraduate School, Monterey, CA 93943, USA

  • Venue:
  • Operations Research Letters
  • Year:
  • 1999

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Abstract

A stochastic program SP with solution value z^* can be approximately solved by sampling n realizations of the program's stochastic parameters, and by solving the resulting ''approximating problem'' for (x^*"n,z^*"n). We show that, in expectation, z^*"n is a lower bound on z^* and that this bound monotonically improves as n increases. The first result is used to construct confidence intervals on the optimality gap for any candidate solution x@^ to SP, e.g., x@^=x^*"n. A sampling procedure based on common random numbers ensures nonnegative gap estimates and provides significant variance reduction over naive sampling on four test problems.