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From "Christian Steinert (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1993) MoreLikeThis - allow to exclude terms that appear in too many documents (patch included)
Date Mon, 19 Oct 2009 11:49:31 GMT
MoreLikeThis - allow to exclude terms that appear in too many documents (patch included)
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                 Key: LUCENE-1993
                 URL: https://issues.apache.org/jira/browse/LUCENE-1993
             Project: Lucene - Java
          Issue Type: Improvement
          Components: contrib/*
    Affects Versions: 2.9
            Reporter: Christian Steinert
         Attachments: MoreLikeThis.java.patch

The MoreLikeThis class allows to generate a likeness query based on a given document. So far,
it is impossible to suppress words from the likeness query, that appear in almost all documents,
making it necessary to use extensive lists of stop words.

Therefore I suggest to allow excluding words for which a certain absolute document count or
a certain percentage of documents is exceeded. Depending on the corpus of text, words that
appear in more than 50 or even 70% of documents can usually be considered insignificant for
classifying a document.      

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