Maybe I'm not being quite clear enough. I'm not simply looking to boost a
field by a fixed amount and it's not likely that the field is going to match a
word in the query because we won't be searching for dates. So that means that
that fields boost will not be taken into consideration because there is no
match.
For example, All my documents have a publication date. And I want newer
documents to be ranked slightly higher than older documents. Say I am
searching for the word "Lucene" and it returns a list of 10 documents. The
third one was written today and the first and second documents were written 2
months ago but get ranked slightly higher because of their score. Each of
these documents have a date field("pubdate") which has the following values.
20060130
20060210
20060329
Now, I want to turn these dates into numbers, multiply them by a factor and add
them to the total weight. e.g.
Date -> (Numerical value(mil.) / (Convert to days) * (daily multiply factor) =
(Boost Result)
20060130 -> 1138597200000 / (1000 * 60 * 60 * 24 ) * 0.00002 = 0.26356416...
20060210 -> 1139547600000 / (1000 * 60 * 60 * 24 ) * 0.00002 = 0.26378416...
20060329 -> 1143608400000 / (1000 * 60 * 60 * 24 ) * 0.00002 = 0.26472416...
This is the current equation I'm hoping to use but I haven't quite worked it
out. If I can add the boost result to the final score then I'm hoping more
recent articles will get a slightly higher ranking.
I hope you understand what I'm trying to accomplish and maybe you can help me
figure out where I should look.
Thank you,
Steve.
-----Original Message-----
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 30, 2006 9:51 AM
To: [email protected]
Subject: Re: Date Boosting
On Mar 30, 2006, at 8:50 AM, Schwenker, Stephen wrote:
> I'm new to Lucene and I want to make a query to dynamically boost a
> document slightly based on a date field. I'm not sure which
> classes are used to calculate the boost, so I wanted to ask which
> classes I should extend to accomplish this? I'm just asking so I
> can get to the job faster. I don't want to waste my time looking
> in places I don't need to.
Extending classes is not necessary. To boost a date field you can
simply call Field.setBoost(). Use IndexSearcher.explain() to see
how your boosts affect scoring.
Since you might need dynamic data boosting, perhaps the new
FunctionQuery would be more what you're after though?
Erik
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