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From Andrew Boyd <andrew.b...@mindspring.com>
Subject RE: calculate wi = tfi * IDFi for each document.
Date Thu, 02 Jun 2005 19:21:35 GMT
Ok.  So if I get 10 Documents back from a search and I want to get the top 5 weighted terms
for each of the 10 documents what API call should I use?  I'm unable to find the connection
between Similarity and a Document.

I know I'm missing the elephant that must be in the middle of the room.  Or maybe it's not
there.
Is what I'm trying to do do-able?

Thanks,

Andrew

-----Original Message-----
From: Max Pfingsthorn <m.pfingsthorn@hippo.nl>
Sent: Jun 2, 2005 5:33 AM
To: java-user@lucene.apache.org
Subject: RE: calculate wi = tfi * IDFi for each document.

Hi,

DefaultSimilarity uses exactly this weighting scheme. Makes sense since it's a pretty standard
relevance measure...

Bye!
max

-----Original Message-----
From: Andrew Boyd [mailto:andrew.boyd@mindspring.com]
Sent: Thursday, June 02, 2005 11:39
To: java-user@lucene.apache.org
Subject: calculate wi = tfi * IDFi for each document.


If I have search results how can I calculate, using lucene's API,  wi = tfi * IDFi for each
document.

wi    = term weight
tfi    = term frequency in a document
IDFi = inverse document frequency = log(D/dfi)
dfi   = document frequency or number of documents containing term i
D    = number of documents in my search result

Thanks,

Andrew

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