Re: Computing Relevancy Differently

[Doug Cutting]

Terry Steichen wrote:

I read all the relevant references I could find in the Users (not
Developers) list, and I still don't exactly know what to do.

What I'd like to do is get a relevancy-based order in which (a) longer
documents tend to get more weight than shorter ones, (b) a document body
with 'X' instances of a query term gets a higher ranking than one with fewer
than 'X' instances. and (c) a term found in the headline (usually in
addition to finding the same term in the body) is more highly ranked than
one with the term only in the body.

In the latest sources this can all be done by defining your own Similarity implementation. You can make longer documents score higher by overriding the lengthNorm() method. You can boost headlines there, or with Field.setBoost(), or at query time with Query.setBoost().

Doug


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