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From "Ghinwa Choueiter" <ghi...@csail.mit.edu>
Subject Re: Scoring a query with OR's
Date Sun, 09 Mar 2008 17:38:28 GMT
but shouldn't the coord factor kick in with AND instead of OR? I understand 
why you would want to use coord in the case of AND, where you reward more 
the documents that contain most of the terms in the query. However in the 
case of OR, it should not matter if all the OR  operands are in the 
document?

-Ghinwa

----- Original Message ----- 
From: "Erik Hatcher" <erik@ehatchersolutions.com>
To: <java-user@lucene.apache.org>
Sent: Sunday, March 09, 2008 1:22 PM
Subject: Re: Scoring a query with OR's


>
> On Mar 9, 2008, at 12:39 PM, Ghinwa Choueiter wrote:
>> but what exactly happens when there are OR's, for eg.  (life OR  place OR 
>> time)
>>
>> The scoring equation can get a score for life, place, time  separately, 
>> but what does it do with them then? Does it also add them.
>
> The coord factor kicks in then:
>
> <http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc//org/ 
> apache/lucene/search/DefaultSimilarity.html#coord(int,%20int)>
>
> the formula listed here should help too:
>
> <http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc//org/ 
> apache/lucene/search/Similarity.html>
>
> Erik
>
>
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