On Jun 18, 2005, at 7:39 PM, Paul Libbrecht wrote:
I read the lucene-book about scoring and read a bit of the javadoc
but I can't seem to find somewhere expectations of the bouds for
the score value.
I had believe the score would end up between 0 and 1 but I seem to
keep having values under 0.2. It may be due to my special requests
but... how can I be sure of this ?
Hits from all non-HitCollector searches are "normalized". Normalized
in this sense means that if the top-scoring document scores higher
than 1.0 it is normalized to 1.0 and that ratio is used to normalize
all scores. However, if the top-scoring document is under 1.0, the
scores are left as-is.
Searches using a HitCollector are always left as-is.
Have a look at IndexSearcher.explain() results for document/query
combinations to see what is causing the lower than expected scores.
Erik
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