Hi, Erik,
What do you think about the difference?
Thank you very much for your reply,
Xin
----- Original Message -----
From: "Erik Hatcher" <[EMAIL PROTECTED]>
To: <java-user@lucene.apache.org>
Sent: Wednesday, August 02, 2006 3:56 PM
Subject: Re: scoring formula
Please disregard my previous quick reply as I did not fully read your
message before replying. *ugh*
Erik
On Aug 2, 2006, at 2:32 PM, Zhao, Xin wrote:
Hi,
I noticed the scoring formula in the errata of book "Lucene in Action" is
a little different from the one in Javadoc. I enclosed the one in Javadoc
at the end of email. getBoost(t in q) is in Javadoc's formula (which I
assume is the correct one), but not in "lucene in action". Any idea? We
need to re-implement the scoring in our application. What I understand is
for each term in query, we should multiply the indexing boost( the boost
manfully added while indexing) with the query boost, and with term
frequency, lengthnorm, idf. So the formula in Javadoc makes more sense to
me. Please correct me if I am wrong. Totally new to Lucene.
Appreciate your help,
Xin
*************************************************************
score(q,d) =
Σ ( tf(t in d) * idf(t)^2 * getBoost(t in q) * getBoost (t.field in
d) * lengthNorm(t.field in d) ) * coord(q,d) *
queryNorm(sumOfSqaredWeights)
t in q
************************************************************
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