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Other stemmers exist, e.g., Lovins stemmer
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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