Usually when i search for something, i know exactly what i am expecting to find, the user that don't know what will find isn't searching for nothing, since random search will provide random walks over a certain result path, I believe that search generally speaking is the expectation of some agreement on extension of what was presumable the hypothesis of search since search is a mechanism of throwing hypothesis.
That is why is used on other fields like research and investigation. Random search is equivalent a usage like computer games, and is merely a speculation of ranking. On Wed, Apr 16, 2014 at 2:03 PM, Jack Krupansky <j...@basetechnology.com>wrote: > By definition "OR" is the "disjunction" operator, and "AND" is the > "conjunction" operator. > > Yes, the default operator is "OR" (the disjunction operator.) > > The original question could have been phrased as "Why is recall more > important than precision?" > > The answer to that is rooted in the fact that people most commonly don't > know exactly what they are looking for and commonly make mistakes and > misuse terms. Sometimes this is called "discovery mode". Using OR means > that documents can be matched even if all of the terms are not present. OR > may match more documents, but at least you will miss fewer documents. > > A second part to the answer is that relevancy boosting causes documents > with more of the terms to be ranked higher, so it merely LOOKS like the > terms were ANDed. This gives you the best of both worlds. > > Using explicit operators gives you "precision", which power users will > appreciate. Average users just get annoyed when the search engine is being > so picky. > > -- Jack Krupansky > > -----Original Message----- From: Jose Carlos Canova > Sent: Wednesday, April 16, 2014 12:53 PM > To: java-user@lucene.apache.org > Subject: Re: is there a historical reason why default conjunction operator > is "OR"? > > > In fact you have both, the documents at see looking at first time is first > the results with all words (AND) then the ORed results, which makes perfect > sense. Google sometimes marks on the result which word was not found with > a "strike through". > > But it is not so powerful as logical operators on query clauses if you want > to filter large data sets. It will always return a value even if you don't > want it. > > > On Wed, Apr 16, 2014 at 1:38 PM, Herb Roitblat <herb.roitb...@orcatec.com> > wrote: > > Actually, Google uses OR. The scoring algorithm favors documents that >> match on more of the ORed terms. >> >> >> On 4/16/2014 8:17 AM, Min-Uk Kim wrote: >> >> Hello everyone, >>> >>> I recently wondered, >>> why lucene's default conjunction operator is "OR". >>> Is there a historical reason for that? >>> >>> By the way, >>> Google and other search engines seem to use "AND". >>> >>> Please show me the light. >>> M >>> >>> >>> >> --------------------------------------------------------------------- >> 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 > >
