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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