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From "Karl Koch" <TheRan...@gmx.net>
Subject Re: Lucene scoring: coord_q_d factor
Date Thu, 14 Dec 2006 09:26:46 GMT
I think I understand now. I also have evidence from literature. So I would say that my question
is solved. :) 

Thank you, Otis, and everybody else for contributing!
Karl

-------- Original-Nachricht --------
Datum: Thu, 14 Dec 2006 09:40:31 +0100
Von: Soeren Pekrul <soeren.pekrul@gmx.de>
An: java-user@lucene.apache.org
Betreff: Re: Lucene scoring: coord_q_d factor

> Karl Koch wrote:
> > If I do not misunderstand that extract, I would say it suggests the 
> combination of coordination level matching with IDF. I am interested in your
> view and those who read this? 
> 
> I understand that sentence:
> "The natural solution is to correlate a term's matching value with its 
> collection frequency."
> exactly in that way, to combine coordination level matching with IDF.
> 
> The score for a document is the sum of the term weights w(tf, idf) for 
> each containing term. So you have already the combination of 
> coordination level matching with IDF. Now it is possible that your query 
> requests three terms A, B and C. Two of them (A and B) are quite often 
> in the collection one (C) is very rare. It could be possible that 
> documents are matching just C have a higher score than documents 
> containing A and B. To avoid this you can give the coordination a higher 
> influence by multiplying the sum of term weights with the coordination 
> as additional factor.
> 
> Sören
> 
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