The best source of information about the ranking done by MG (and MGPP,
which is similar) is the "Managing Gigabytes" book, by Ian H. Witten,
Alistair Moffat and Tim Bell.
If you're technically inclined the cheap version is to look at the code
and its comments :-)
Ying-Hsang Liu wrote:
> I am using Greenstone for an information retrieval experiment. After
> Greenstone documentation and the following message, it is still not
> clear to me
> how the ranking works in Greenstone (I am using version 2.70),
> MGPP search engine.
> My collection is built upon MGPP. If I search the system using
> advanced form
> search and choose the option "Search and display results in ranked
> order," how
> does the system work?
> Is it a Boolean-based search with ranked output? Or, is it a ranked
> query, like
> the "Some" option search in simple form search? If either one involves
> the ranking
> of search results, could I get more detailed descriptions in technical
> reports or
> published papers?
> Ying-Hsang Liu
> PhD Student
> Rutgers - The State University
> School of Communication,
> Information and Library Studies
> 4 Huntington St.
> New Brunswick, NJ 08901
> *Michael Dewsnip* mdewsnip at cs.waikato.ac.nz
> /Fri Sep 26 11:39:51 NZST 2003/
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> Hi Stephen,
> Thanks very much for your answer.
> In regards to the ordering of the search results, it depends on whether a
> boolean or ranked query is being performed. For a ranked query the search
> results are ordered according to how closely they match the query (as you
> would expect). For a boolean query, a document either matches or
> doesn't, so
> there is no scope for ordering. Therefore, the documents are simply listed
> based on the order they were indexed by MG/MGPP, as you guessed.
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