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
************************************************************
