Hi, But isn't "coord" + TFIDF pretty intuitive? Independently, they are both useful and contribute to the final score for the match.
Otis ----- Original Message ---- From: Karl Koch <[EMAIL PROTECTED]> To: java-user@lucene.apache.org Sent: Wednesday, December 13, 2006 8:35:55 PM Subject: Re: Lucene scoring: coord_q_d factor Hello Paul, thank you for providing the link to that paper. I read it again, and you are right. I discovered the following text part: "In normal term co-ordination matches, if a request and document have a frequent term in common, this counts for as much as a non-frequent one; so if a request and document share three common terms, the document is retrieved at the same level as another one sharing three rare terms with the request. But it seems we should treat matches on non-frequent terms as more valuable than ones on frequent terms, without disregarding the latter altogether. The natural solution is to correlate a term's matching value with its collection frequency." 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? Are there any other papers that regard the combination of coordination level matching and TFxIDF as advantageous? Cheers, Karl -------- Original-Nachricht -------- Datum: Wed, 13 Dec 2006 21:00:45 +0100 Von: Paul Elschot <[EMAIL PROTECTED]> An: java-user@lucene.apache.org Betreff: Re: Lucene scoring: coord_q_d factor > On Wednesday 13 December 2006 16:42, Karl Koch wrote: > > Do you know about any papers that discuss this? > > Coordination is called co-ordination In the original idf paper by > K. Spärck Jones, A statistical interpretation of term specificity > and its application in retrieval., Journal of Documentation 28, > 11-21, 1972 > http://www.soi.city.ac.uk/~ser/idfpapers/ksj_orig.pdf > > The paper is the first one on the idf page: > http://www.soi.city.ac.uk/~ser/idf.html > > Regards, > Paul Elschot > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
