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Major Tasks in Data Preprocessing

  • Data cleaning
    • Fill in missing values, smooth noisy data, identify or remove outliers, and resolve inconsistencies
  • Data integration
    • Integration of multiple databases, data cubes, or files
  • Data reduction
    • Dimensionality reduction
    • Numerosity reduction
    • Data compression
  • Data transformation and data discretization
    • Normalization
    • Concept hierarchy generation

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