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Other stemmers

  • Other stemmers exist, e.g., Lovins stemmer

    • http://www.comp.lancs.ac.uk/computing/research/stemming/general/lovins.htm

    • Single-pass, longest suffix removal (about 250 rules)

  • Full morphological analysis – at most modest benefits for retrieval

  • Do stemming and other normalizations help?

    • English: very mixed results. Helps recall but harms precision

      • operative (dentistry) ⇒ oper

      • operational (research) ⇒ oper

      • operating (systems) ⇒ oper

    • Definitely useful for Spanish, German, Finnish, …

      • 30% performance gains for Finnish!


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