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Date: Mon, 19 Oct 2009 04:49:31 -0700 (PDT)
From: "Christian Steinert (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-1993) MoreLikeThis - allow to exclude terms
 that appear in too many documents (patch included)
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     [ https://issues.apache.org/jira/browse/LUCENE-1993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christian Steinert updated LUCENE-1993:
---------------------------------------

    Attachment: MoreLikeThis.java.patch

suggested patch against current SVN head

> MoreLikeThis - allow to exclude terms that appear in too many documents (patch included)
> ----------------------------------------------------------------------------------------
>
>                 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
>
>   Original Estimate: 0.17h
>  Remaining Estimate: 0.17h
>
> 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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