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On Sat, Feb 28, 2009 at 3:02 PM, Peter Keegan <peterlkeegan@xxxxxxxxx> wrote:
>> in situations where you deal with simple query types, and matching query
> structures, the queryNorm
>> *can* be used to make scores semi-comparable.
>
> Hmm. My example used matching query structures. The only difference was a
> single term in a field with zero weight that didn't exist in the matching
> document. But one score was 3X the other.
But the zero boost was an index-time boost, and the queryNorm takes
into account query-time boosts and idfs. You might get closer to what
you expect with a query time boost of 0.0f
The other thing affecting the score is the coord factor - the fact
that fewer of the optional terms matched (1/2) lowers the score. The
coordination factor can be disabled on any BooleanQuery.
If you do both of the above, I *think* you would get the same scores
for this specific example.
-Yonik
http://www.lucidimagination.com
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