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Subject: Newbie questions re: scoring
Date: Thu, 4 May 2006 09:10:54 -0400
Message-ID: <D3FB08E688E4954EADE12CCFFA2F2548D65FA2@canat0411.ca.deloitte.com>
Thread-Topic: Newbie questions re: scoring
Thread-Index: AcZvfCyVjy0BlyHhT7mG1/aivbiUKQ==
From: "Lee, Andrew J \(CA - Toronto\)" <andrlee@deloitte.ca>
To: <java-user@lucene.apache.org>
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Hi,=0D=0A=0D=0AI am new to Lucene and this mailing list, so my apologies if=
 these=0D=0Aquestions have already been answered=2E=0D=0A=0D=0A1)  I create=
 an index with one document with a searchable field of "All=0D=0Adogs are b=
rown=2E"  If I search on that index with a query of "All dogs=0D=0Aare brow=
n=2E" I do not get a hit with score 1=2E0, but something low like=0D=0A0=2E=
38=2E  I tried looking at the scoring algorithm and can't make heads or=0D=
=0Atails of it=2E  Can anybody explain it to me in simple terms?=0D=0A=0D=
=0A2)  I have an index of documents, then run a search against it=2E  I run=
=0D=0Athrough the list of hits, building a Vector of documents whose score =
is=0D=0Aabove a certain threshold=2E  If I run the program with a threshold=
 of=0D=0Asay, 0=2E15, I'll get a Vector of documents with scores >=3D 0=2E1=
5 (as=0D=0Aexpected)=2E  If I set the threshold higher (0=2E30, for example=
) and rerun=0D=0Athe program, I see some of the same documents that I thoug=
ht would have=0D=0Abeen trimmed off with the higher threshold=2E  With a th=
reshold of 0=2E15=0D=0Athey would score 0=2E17, and with a threshold of 0=
=2E30 they are scoring=0D=0Asomething like 0=2E33=2E  Can anybody explain t=
his?  My trimming is coming=0D=0Apost-index-searching, so this is pretty co=
nfusing=2E=0D=0A=0D=0AThanks in advance for any help=2E=0D=0A=0D=0AAndrew L=
ee=0D=0A=0D=0A=0D=0A=0D=0A-----------------------------------------=0D=0A**=
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