Estimating Hybrid Frequency Moments of Data Streams

  • Authors:
  • Sumit Ganguly;Mohit Bansal;Shruti Dube

  • Affiliations:
  • Indian Institute of Technology, Kanpur,;Indian Institute of Technology, Kanpur,;Indian Institute of Technology, Kanpur,

  • Venue:
  • FAW '08 Proceedings of the 2nd annual international workshop on Frontiers in Algorithmics
  • Year:
  • 2008

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Abstract

A two-dimensional stream is a sequence of coordinate-wise updates to a two-dimensional array (Ai,j)1 ≤ i,j≤ n. The hybrid frequency moments Fp,q(A) is defined as . For every 0 驴p,q驴 [0,2], we present an $O(\epsilon^{-6} \text{poly}(\log n, \log m, \log (1/\epsilon)))$ space algorithm for the problem of estimating Fp,q, where, mis an upper bound on .