Computing the Median with Uncertainty

  • Authors:
  • Tomás Feder;Rajeev Motwani;Rina Panigrahy;Chris Olston;Jennifer Widom

  • Affiliations:
  • -;-;-;-;-

  • Venue:
  • SIAM Journal on Computing
  • Year:
  • 2003

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Abstract

We consider a new model for computing with uncertainty. It is desired to compute a function f(X1,. . .,Xn), where X1, . . ., Xn are unknown but guaranteed to lie in specified intervals I1, . . ., In. It is possible to query the precise value of any Xj at a cost cj. The goal is to pin down the value of f to within a precision $\delta$ at a minimum possible cost. We focus on the selection function f which returns the value of the kth smallest argument. We present optimal offline and online algorithms for this problem.