I was just reading the Similarity javadocs ( http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/search/Similarity.html#formula_queryNorm) and I thought this might be relevant to your issue.
>From the javadoc: *queryNorm(q) * is a normalizing factor used to make scores between queries comparable. This factor does not affect document ranking (since all ranked documents are multiplied by the same factor), but rather just attempts to make scores from different queries (or even different indexes) comparable. This is a search time factor computed by the Similarity in effect at search time. M On Wed, Feb 25, 2009 at 10:48 PM, Michael Stoppelman <stop...@gmail.com>wrote: > Hi Ken, > > I found this post on the Lucene documentation page: > http://wiki.apache.org/lucene-java/LuceneFAQ#head-912c1f237bb00259185353182948e5935f0c2f03 > > In practice you sometimes need to have a cut-off or boost factor post > tf-idf scoring. The way I've been going about it is by picking values and > seeing if the results are better. > I'm sure there is a deep information theory problem there. > > M > > On Wed, Feb 25, 2009 at 8:38 AM, Ken Williams < > ken.willi...@thomsonreuters.com> wrote: > >> Hi all, >> >> I didn't get a response to this - not sure whether the question was >> ill-posed, or too-frequently-asked, or just not interesting. But if >> anyone >> could take a stab at it or let me know a different place to look, I'd >> really >> appreciate it. >> >> Thanks, >> >> -Ken >> >> >> On 2/20/09 12:00 PM, "Ken Williams" <ken.willi...@thomsonreuters.com> >> wrote: >> >> > Hi, >> > >> > Has there been any work done on getting confidence scores at runtime, so >> > that scores of documents can be compared across queries? I found one >> > reference in the mailing list to some work in 2003, but couldn't find >> any >> > follow-up: >> > >> > http://osdir.com/ml/jakarta.lucene.user/2003-12/msg00093.html >> > >> > Thanks. >> >> -- >> Ken Williams >> Research Scientist >> The Thomson Reuters Corporation >> Eagan, MN >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >> For additional commands, e-mail: java-user-h...@lucene.apache.org >> >> >
