Dear All, Thanks for your feedback. I want to do research on how lucene performs compared to Latent Semantic analysis in terms of recall and precision. I welcome ideas on this,does anyone know a software tool using latent semantic analysis that I could also download and try it?At the moment I am doing some simulation using Mathlab. Thank you
David --- On Thu, 15/1/09, Murat Yakici <murat.yak...@cis.strath.ac.uk> wrote: From: Murat Yakici <murat.yak...@cis.strath.ac.uk> Subject: Re: Testing Precision and Recall on Lucene To: java-user@lucene.apache.org Date: Thursday, 15 January, 2009, 12:17 PM Let's please don't forget the scoring function. Yes, *query* is important, however, everyone in IR knows that two different scoring functions may return two different sets of results for the same query! David, I think you have to be more explicit here. What exactly are you trying to do? Are you gonna benchmark Lucene's performance between similar queries (as Donna suggests) or between different frameworks. To use metrics like precision and recall you need to do a test on the same collection as well. Murat > I don't think this question makes a whole lot of sense in isolation-- > precision and recall is all about the *query* and that is the art of the > developer; what is the appropriate query for your particular application. > Lucene does just great telling you which documents had which terms and > which term combinations, and does a very good job of scoring them and > ranking them once you give a query. But *you* have to decide what the > appropriate query is for your application. The simplest approach, and > perhaps what you are looking for, is the MoreLikeThis query generator, > which uses (pretty good) heuristics for telling you which documents are > "like" a given document, but I don't know if that's the direction you are > looking for. > > > david muchangi <davemugo2...@yahoo.co.uk> wrote on 01/14/2009 02:00:33 PM: > >> Dear All, >> I wish to have a quick test on how lucene performs in terms of >> precision and recall.Anyone with a small application that I can use >> quickly without having to program using the APIs? >> Thanks. >> David >> >> >> >> >> >> >> Murat Yakici Department of Computer & Information Sciences University of Strathclyde Glasgow, UK ------------------------------------------- The University of Strathclyde is a charitable body, registered in Scotland, with registration number SC015263. --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org