Hi Otis, thank you for this super quick answer. I understand that normalizing and comparing scores is fishy, and I wouldn't want to do it for regular search results.
I just thought that in this special case, the maxScore which is returned for the input document to the MoreLikeThis handler -- and this is only present in MoreLikeThis responses (with include=true) -- might be the missing additional value that would allow to normalize on. (In this special case there are two maxScores.) But I don't know what the match's maxScore is derived from. As the input element should surely be the best match for the request a maxScore of 13.4579935 looks suspicious? Thanks, Chantal On Thu, 2010-06-24 at 16:25 +0200, Otis Gospodnetic wrote: > Chantal, > > The short answer is that you can't compare relevancy scores across requests. > I think this may be in a FAQ. > Check this: > http://search-lucene.com/?q=score+compare+absolute+relative&fc_project=Lucene&fc_project=Solr > > Otis > ---- > Sematext :: http://sematext.com/ :: Solr - Lucene - Nutch > Lucene ecosystem search :: http://search-lucene.com/ > > > > ----- Original Message ---- > > From: Chantal Ackermann <chantal.ackerm...@btelligent.de> > > To: "solr-user@lucene.apache.org" <solr-user@lucene.apache.org> > > Sent: Thu, June 24, 2010 10:17:57 AM > > Subject: MoreLikeThis (mlt) : use the match's maxScore for result score > > normalization > > > > Hi there, > > consider the following response extract for a MoreLikeThis > > request: > > <result name="match" numFound="1" start="0" > > maxScore="13.4579935"> > <result name="response" numFound="103708" > > start="0" > maxScore="4.1711807"> > > The first result element is the > > document that was input and for which to > return "more like this" > > results. > The second result element contains the results returned by the > > handler. > > As they both come with a different maxScore I was wondering > > whether I > could safely use the match's maxScore to normalize the scores of > > the > "more like this" documents. > > Would that allow to reflect to the > > user the quality/relevancy of the > hits for different MoreLikeThis requests > > (and only those)? > (What does the match's maxScore > > mean?) > > Thanks! > Chantal
