Hi, Any reply on this: How are the documents sequenced in the case when the product of tf idf , coord and fieldnorm is same for both the documents?
Thanks - David P.S : This link was very useful to understand the scoring in detail: http://mail-archives.apache.org/mod_mbox/lucene-java-user/201008.mbox/%3CAANLkTi=jpph3x5tlkbj_rax5qhex6zrcguiunhqbf...@mail.gmail.com%3E On Mon, Mar 4, 2013 at 4:08 PM, David Philip <davidphilipshe...@gmail.com>wrote: > Hi Chris, > > Thank you for the reply. okay understood about *fieldWeight*. > > I am actually curious to know how are the documents sequenced in this case > when the product of tf idf and fieldnorm is same for both the documents? > > Afaik, at the first step, documents are sequenced based on > fieldWeight(product of tf idf and fieldnorm) order by desc[correct?]. But > if both are same then what is the next factor taken in consideration to > sequence? > > In the below case , why doc 1 is come first and then doc2 when both > scores are same. > > : 1.0469098 =, > : *(MATCH) fieldWeight(title:updated in 7), * > : product of: 1.0 = tf(termFreq(title:updated)=1), 2.7917595 = > idf(docFreq=2, > : maxDocs=18), 0.375 = fieldNorm(field=title, doc=7) > : > : 1.0469098 =, > : *(MATCH) fieldWeight(title:updated in 9), * > : product of: 1.0 = tf(termFreq(title:updated)=1), 2.7917595 = > idf(docFreq=2, > : maxDocs=18), 0.375 = fieldNorm(field=title, doc=7) > > > > > Thanks - David > > > > > > > > > > On Sat, Mar 2, 2013 at 12:23 PM, Chris Hostetter <hossman_luc...@fucit.org > > wrote: > >> >> : In the explain tag (debugQuery=true) >> : what does the *fieldWeight* value refer to?, >> >> fieldWeight is just a label being put on the the product of the tf, idf, >> and fieldNorm for that term. (I don't remember why it's refered to as the >> "fieldWeight" ... i think it may just be historical, since these are all >> factors of the "field query" (ie: "term query", as opposed to a "boolean >> query" across multiple fields) >> >> >> : *1.0469098* is the product of tf, idf and fieldNorm, for both the >> records. >> : But field weight is different. I would like to know what is the field >> >> what do you mean "field weight is different" ? ... in both of the examples >> you posted, the fieldWeight is 1.0469098 ? >> >> Are you perhaps refering to the numbers "7" and "9" that appear inside the >> fieldWeight(...) label? Those are just refering to the (internal) >> docids (just like in the "fieldNorm(...)") >> >> : 1.0469098 =, >> : *(MATCH) fieldWeight(title:updated in 7), * >> : product of: 1.0 = tf(termFreq(title:updated)=1), 2.7917595 = >> idf(docFreq=2, >> : maxDocs=18), 0.375 = fieldNorm(field=title, doc=7) >> : >> : 1.0469098 =, >> : *(MATCH) fieldWeight(title:updated in 9), * >> : product of: 1.0 = tf(termFreq(title:updated)=1), 2.7917595 = >> idf(docFreq=2, >> : maxDocs=18), 0.375 = fieldNorm(field=title, doc=7) >> >> >> -Hoss >> > >
