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What Is Stem Confusion?

Stemming confusion is a problem that occurs when the stemming algorithm regroups words of different nature under the same stem. It is rare, but can be caused if the use of a stemming algorithm is not optimized for the languages of the documents.

Example: The English stemming algorithm used to index words in French can regroup the words Accéder (access in French) and Accede under the same stem (Acce-).