if you use norms lucene uses the boost of the fields / document and multiplies it with a length normalization factor -> 1.0 / Math.sqrt(numTerms) so you scores should be different. Does that explain what you are seeing?
Simon On Sun, Jun 19, 2011 at 7:06 AM, Saurabh Gokhale <saurabhgokh...@gmail.com> wrote: > Hi All, > I have a question regarding index time parameter Index.ANALYZED_NO_NORMS > and Index.ANALYZED > As per the definition, ANALYZED_NO_NORMS is no different than ANALYZED > option except that it does not store norm (boost) information in the index. > So if I create 2 indexes: 1 with ANALYZED option and another > with ANALYZED_NO_NORMS option, for the same indexed document and for the > same search query both should bring same result with same matching > percentile. > But the percentile for the index created using NO_NORM is higher than the > one created with NORM. Why is that so? > Attached is the java example with 2 indexes created and the same document > searched using BooleanQuery. > The result indicates that though the matched documents are same, their > percentiles differ? can some one pls help me understand norm better? is it > because in the index with norm, lucene adds some boost for index fields? > > > Result of running the program is: > -------------------------------------------------------------------------------------------- > Adding Doc to NORM Index :: author : author1 > --------------------------------------- > Adding Doc to NO NORM Index :: author : author1 > ======================================= > Adding Doc to NORM Index :: author : author2 > --------------------------------------- > Adding Doc to NO NORM Index :: author : author2 > ======================================= > Adding Doc to NORM Index :: author : author3 > --------------------------------------- > Adding Doc to NO NORM Index :: author : author3 > ======================================= > Adding Doc to NORM Index :: author : author4 > --------------------------------------- > Adding Doc to NO NORM Index :: author : author4 > ======================================= > Search for the book with Author: author1 > NORM:: WITH NORM Query :: (author:author1) (subject:book subject:first > subject:my) -isbn:123 > Match: 19.738173% || Doc Author: author2 || Doc subject: My next book || > Doc ISBN: 333 > Match: 6.168179% || Doc Author: author3 || Doc subject: this first text || > Doc ISBN: 444 > Search for the book with Author: author1 > NORM:: WITHOUT NORM Query :: (author:author1) (subject:book subject:first > subject:my) -isbn:123 > Match: 39.476345% || Doc Author: author2 || Doc subject: My next book || > Doc ISBN: 333 > Match: 9.869086% || Doc Author: author3 || Doc subject: this first text || > Doc ISBN: 444 > > > Thanks > Saurabh > > --------------------------------------------------------------------- > 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
