What's not concise about a complex math formula? :-)
The basic Term Vector approach to IR, that Lucene more or less
implements, says that the score for a document given a query is the
cosine of the angle formed between the query vector and the document
vector.
I like to draw a standard x-y axis graph and then draw two vectors,
one being the query and the other the document and then draw in the
angle between them (w/ their tails at the same point). The score is
the cosine of that angle (more or less). That is usually sufficient
for "most people". People who like math can read the formula.
-Grant
On Sep 3, 2008, at 6:17 AM, Jon Loken wrote:
Hi all,
I have attempted to find a concise definition of how the Lucene
score is
calculated, something that can be understood by most people.
The information I found is accurate, but not particularly concise.
http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc//org/apac
he/lucene/search/Similarity.html
If there is no boosting or sorting involved, how is a default sort
calculated?
Many thanks,
Jon
BiP Solutions Limited is a company registered in Scotland with
Company Number SC086146 and VAT number 383030966 and having its
registered office at Park House, 300 Glasgow Road, Shawfield,
Glasgow, G73 1SQ
****************************************************************************
This e-mail (and any attachment) is intended only for the attention
of the addressee(s). Its unauthorised use, disclosure, storage or
copying is not permitted. If you are not the intended recipient,
please destroyall copies and inform the sender by return e-mail.
This e-mail (whether you are the sender or the recipient) may be
monitored, recorded and retained by BiP Solutions Ltd.
E-mail monitoring/ blocking software may be used, and e-mail content
may be read at any time. You have a responsibility to ensure laws
are not broken when composing or forwarding e-mails and their
contents.
****************************************************************************
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
--------------------------
Grant Ingersoll
http://www.lucidimagination.com
Lucene Helpful Hints:
http://wiki.apache.org/lucene-java/BasicsOfPerformance
http://wiki.apache.org/lucene-java/LuceneFAQ
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
