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Challenges for OLAP on Sampling Data

  • Computing confidence intervals in OLAP context
  • No data?
    • Not exactly. No data in subspaces in cube
    • Sparse data
    • Causes include sampling bias and query selection bias
  • Curse of dimensionality
    • Survey data can be high dimensional
    • Over 600 dimensions in real world example
    • Impossible to fully materialize

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