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https://issues.apache.org/jira/browse/LUCENE-3934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241120#comment-13241120
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Robert Muir commented on LUCENE-3934:
-------------------------------------
This seems bad: Andrzej is this something thats not too difficult to fix for
3.6?
> 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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