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From Robert Muir <rcm...@gmail.com>
Subject Re: idf calculation in Lucene ?
Date Thu, 27 Oct 2011 12:41:58 GMT
On Thu, Oct 20, 2011 at 3:11 PM, David Ryan <helponr@gmail.com> wrote:

>
> However, in some case,  when I search o'reilly ,  I see
>
>  *  44.0865 = idf(title: o''reilli=4 o=1488 reilli=14 oreilli=4)*
>
> In this cae, How is IDF calculated?
>

thats a phrase or multiphrase query.

in this case it sums up the idf of each term:
http://lucene.apache.org/java/3_4_0/api/all/org/apache/lucene/search/Similarity.html#idfExplain(java.util.Collection,
org.apache.lucene.search.Searcher)

-- 
lucidimagination.com

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