Hi there, well, where to start from.... I would suggest you look at the output of Query#explain() first to see how the score is calculated. You might use a simpler query to get started with it as this might be quite cryptic if you see it the first time. To completely understand what the output means have a closer look to the javadoc of the class Similarity (http://lucene.apache.org/java/2_4_1/api/core/org/apache/lucene/search/Similarity.html) this will explain how the score is calculated in the very detail. Once you understand what is going on during the scoring process I would suggest you revise your boosting. I don't know if you have field boost set but it seems it would make more sense in your usecase as far as I can tell. In general make sure you understand what the different boosts are used for - this snippet from the wiki might help you: <snip> What is the difference between field (or document) boosting and query boosting?
Index time field boosts (field.setBoost(boost)) are a way to express things like "this document's title is worth twice as much as the title of most documents". Query time boosts (query.setBoost(boost)) are a way to express "I care about matches on this clause of my query twice as much as I do about matches on other clauses of my query". Index time field boosts are worthless if you set them on every document. Index time document boosts (doc.setBoost(float)) are equivalent to setting a field boost on ever field in that document. </snip> (http://wiki.apache.org/lucene-java/LuceneFAQ#head-246300129b9d3bf73f597facec54ac2ee54e15d7) hope that helps to get started with scoring etc. simon On Tue, Aug 11, 2009 at 10:50 AM, bourne71<gary...@live.com> wrote: > > Hi, > > I am fairly new to Lucene and have encounter a problem with the search > function i am trying to create using Lucene. When I search, lets say "news > sharing", then the results return and display. > > Its fine up to this point until I check the ranking. Some results, although > match only 1 of the 2 keywords, will have higher ranking. The problem is > like describe below: > > Page 1 > news - Total found 23 > sharing - Total found 0 > > Page 2 > news - Total found 1 > sharing - Total found 21 > > This is understandable why Page 1 got better ranking, bcs it has more > keyword found. But this will make the results return to be less relevant > > My current query is like the following: > (url:sharing^2.0 content:sharing title:sharing^1.5) (url:news^2.0 > content:news title:news^1.5) url:"sharing news"~2147483647^2.0 > content:"sharing news"~2147483647 title:"sharing news"~2147483647^1.5 > > Is there anyway I can add an additional query that will give an additional > boost to results that has both the keyword in it? > -- > View this message in context: > http://www.nabble.com/Query-Boosting-tp24913967p24913967.html > Sent from the Lucene - Java Users mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
