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From "Chuck Williams" <ch...@manawiz.com>
Subject RE: About Hit Scoring
Date Sun, 31 Oct 2004 16:57:56 GMT
Exactly, which is what I've proposed.  As pointed out in my analysis,
the boost-weighted normalization will not change the order of the
results currently computed, just the magnitudes of the final scores.

Chuck

  > -----Original Message-----
  > From: Christoph Goller [mailto:goller@detego-software.de]
  > Sent: Sunday, October 31, 2004 9:02 AM
  > To: Lucene Developers List
  > Subject: Re: About Hit Scoring
  > 
  > Chuck Williams schrieb:
  > > Addendum:  I forgot probably the most important point.  The
current
  > > normalization in Hits changes the final score so that it is not
the
  > > distance to the query-orthogonal hyperplane.  This normalization
  > renders
  > > the final score ambiguous, and more confused.  It's ambiguous
since
  > the
  > > normalization may or may not be applied (depending on the fairly
  > > arbitrary condition of whether or not the top raw score is greater
  > than
  > > 1.0).  In cases where the normalization is applied, then a
result's
  > > final score is the ratio of its distance from the query-orthogonal
  > > hyperplane to the largest distance of any result, which doesn't
seem
  > > particularly meaningful to me.  At least there is no absolute
  > > interpretation for this score, in the sense that a specific number
  > > indicates a specific relevance, which is what I'm looking for.
  > 
  > Yes, I omitted this in my analysis as well as the additional coord
term
  > in the score formula.
  > 
  > Instead of the current normalization in Hits, one could apply a
  > squeezing function to the scores, that would guarantee that scores
  > are always between 0 and 1, but keep the order of the original raw
  > scores, since it would be independet of the highest raw score.
  > 
  > Christoph
  > 
  >
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