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From "Andrzej Bialecki (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3934) Residual IDF calculation in the pruning package is wrong
Date Thu, 29 Mar 2012 09:46:28 GMT
Residual IDF calculation in the pruning package is wrong
--------------------------------------------------------

                 Key: LUCENE-3934
                 URL: https://issues.apache.org/jira/browse/LUCENE-3934
             Project: Lucene - Java
          Issue Type: Bug
    Affects Versions: 3.5, 3.6
            Reporter: Andrzej Bialecki 
            Assignee: Andrzej Bialecki 


As discussed on the mailing list (http://markmail.org/message/cwnyfqmet3wophec) there seems
to be a bug in both the formula and in the way RIDF is calculated. The formula is missing
a minus, but also the calculation uses local (in-document) term frequency instead of the total
term frequency (sum of all term occurrences in a corpus).

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