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Comparison With Vector Space

  • Similar in some ways

    • Term weights based on frequency

    • Terms often used as if they were independent

    • Inverse document/collection frequency used

    • Some form of length normalization useful

  • Different in others

    • Based on probability rather than similarity

      • Intuitions are probabilistic rather than geometric

    • Details of use of document length and term, document, and collection frequency differ

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