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Concept Hierarchy Generation for Nominal Data

  • Specification of a partial/total ordering of attributes explicitly at the schema level by users or experts
    • street < city < state < country
  • Specification of a hierarchy for a set of values by explicit data grouping
    • {Urbana, Champaign, Chicago} < Illinois
  • Specification of only a partial set of attributes
    • E.g., only street < city, not others
  • Automatic generation of hierarchies (or attribute levels) by the analysis of the number of distinct values
    • E.g., for a set of attributes: {street, city, state, country}

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