Hi Erick, I understand there are variables that will impact ranking. However, if I leave my edismax setting as is and simply switch from AND to OR as the default Boolean, now if a user types "apples oranges" (without quotes) will the ranking be the same as when I had AND? Will the performance be the same as when I had AND as the default?
Thanks Steve On Wed, Jul 15, 2015 at 12:26 PM, Erick Erickson <erickerick...@gmail.com> wrote: > This is really an apples/oranges comparison. They're essentially different > queries, and scores aren't comparable across different queries. > > If you're asking "if doc 1 and doc 2 are returned by defaulting to AND or > OR, > are they in the same position relative to each other?" then I'm pretty > sure the > answer is "you can't count on it". You'll match on different fields > depending on > what the default is, and with boosting you just don't know. > > Best, > Erick > > On Wed, Jul 15, 2015 at 9:14 AM, Steven White <swhite4...@gmail.com> > wrote: > > By the way, using OR as the default, other than returning more results as > > more words are entered, the ranking and performance of the search remains > > the same right? > > > > Steve > > > > On Wed, Jul 15, 2015 at 12:12 PM, Steven White <swhite4...@gmail.com> > wrote: > > > >> 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 > >>> > ************************************************************************* > >>> > >>> > >> >
