Thank you all. Looks like OR is a better choice vs. AND. Charles: I don't understand what you mean by the "spellcheck component". Do you mean OR works best with spell checker?
Steve On Wed, Jul 15, 2015 at 11:07 AM, Reitzel, Charles < charles.reit...@tiaa-cref.org> wrote: > A common approach to this problem is to include the spellcheck component > and, if there are corrections, include a "Did you mean ..." link in the > results page. > > -----Original Message----- > From: Walter Underwood [mailto:wun...@wunderwood.org] > Sent: Wednesday, July 15, 2015 10:36 AM > To: solr-user@lucene.apache.org > Subject: Re: Which default Boolean operator to set, AND or OR? > > The AND default has one big problem. If the user misspells a single word, > they get no results. About 10% of queries are misspelled, so that means a > lot more failures. > > wunder > Walter Underwood > wun...@wunderwood.org > http://observer.wunderwood.org/ (my blog) > > > On Jul 15, 2015, at 7:21 AM, Jack Krupansky <jack.krupan...@gmail.com> > wrote: > > > It is simply precision (AND) vs. recall (OR) - the former tries to > > limit the total result count, while the latter tries to focus on > > relevancy of the top results even if the total result count is higher. > > > > Recall is good for discovery and browsing, where you sort of know what > > you generally want, but not exactly with any great precision. > > > > Recall will include results that almost meet the query terms, but > > maybe some are missing. > > > > Precision will guarantee and insist that all query terms are present. > > > > One great example for recall is a plagiarism query - enter all the > > terms for a passage and then find documents that most closely > > approximate the passage without being necessarily exact matches. IOW, > > the plagiarizer changes a word here and there. > > > > -- Jack Krupansky > > > > On Wed, Jul 15, 2015 at 8:16 AM, Steven White <swhite4...@gmail.com> > wrote: > > > >> Hi Everyone, > >> > >> Out-of-the box, Solr (Lucene?) is set to use OR as the default > >> Boolean operator. Can someone tell me the advantages / disadvantages > >> of using OR or AND as the default? > >> > >> I'm leaning toward AND as the default because the more words a user > >> types, the narrower the result set should be. > >> > >> Thanks > >> > >> Steve > >> > > > ************************************************************************* > This e-mail may contain confidential or privileged information. > If you are not the intended recipient, please notify the sender > immediately and then delete it. > > TIAA-CREF > ************************************************************************* > >
