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Data Transformation

  • A function that maps the entire set of values of a given attribute to a new set of replacement values s.t. each old value can be identified with one of the new values
  • Methods
    • Smoothing: Remove noise from data
    • Attribute/feature construction
      • New attributes constructed from the given ones
    • Aggregation: Summarization, data cube construction
    • Normalization: Scaled to fall within a smaller, specified range
      • min-max normalization
      • z-score normalization
      • normalization by decimal scaling
    • Discretization: Concept hierarchy climbing

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