Erick Erickson wrote:
I wound up using a TopDocs instead, which has a getMaxScore that
I was able to use to normalize scores to between 0 and 1. In my case
I was collapsing the results into quintiles, so I threw them all
back into a FieldSortedHitQueue to get them sorted by secondary
criteria once the scores were all one of 5 discrete values....
My HitCollector is a variant of TopDocCollector and I have max score. I found
where Hits does the normalisation in Hits.getMoreDocs(). It simply multiplies
all scores by (1/maxScore).
I was looking too deep down around the Scorer...
Can anyone say why this is useful and what's wrong about raw scores?
Thanks
Antony
On 3/29/07, Antony Bowesman <[EMAIL PROTECTED]> wrote:
Hits will normalise scores >0<=1, but I'm using HitCollector and haven't
worked
out how to normalise those scores.
From what I can see, the scores are just multiplied by a factor to bring
the
top score down to 1. Is this right or is there something more to it.
Do I need to normalise scores anyway - what's the reason it's done?
Antony
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