Re: [greenstone-users] ranking order

From Dominique Babini
DateMon, 20 Dec 2004 10:08:55 -0300
Subject Re: [greenstone-users] ranking order
In-Reply-To (41B8CD58-3050001-cs-waikato-ac-nz)
Dear Katherine,
Thank you very much for your reply which we will analyze in our need for a
unique search reply to the user with a frequency ranking of all the
multiple collections of our virtual library
We will keep in touch with you and our list colleagues about our findings.
Best wishes for a Happy New Year to you all,
from Dominique and Florencia (we are in a very hot summer day in Buenos
Aires, Argentina)
CLACSO□s Virtual Library (academic network of 168 social science research
institutions in 21 countries of Latin America and the Caribbean)

Our demo with Greenstone is in http://168.96.200.17/gsdl/cgi-bin/library


Katherine Don <kjdon@cs.waikato.ac.nz> escribe:
>Hi Dominique
>
>Search results are ranked if you do a "some" search and not if you do an
>"all" search. For searching multiple collections, if you do an all
>search, then you get the behaviour you describe. But if you do a some
>search, then documents *are* ranked. Ranks from each collection are
>taken at face value, and the documents ordered by these ranks. This is
>not all that good, as ranks from different collections may not correspond.
>
>To do it properly, you would need to query each collection for the
>frequency of each query term, to calculate the total frequency over all
>the collections. From this you can calculate weights for each query
>term, which you then need to pass in when you do the query. This way the
>ranks will be accurate.
>
>We have never gotten around to implementing this, and have just hoped
>that doing it the easy way was good enough.
>
>I hope this helps,
>Katherine Don
>
>
>
>Dominique Babini wrote:
>> We observe that the ranking of search results is organized by collection
>> and, within each collection, it is not ranked by frequency of term
>> requested. As we have many collections, and a search facility to
>search
>> in "all collections", how can we do so that the results be a ranking by
>> frequency of term requested and considering all collections together?.
>> We appreciate any help,
>> Dominique
>>
>> our virtual library in demo is in
>http://168.96.200.17/gsdl/cgi-bin/library
>>
>>
>> Dra. Dominique Babini
>> Coordinadora Area Informaci□n
>> dbabini@campus.clacso.edu.ar
>>
>> Consejo Latinoamericano de Ciencias Sociales - CLACSO
>> Biblioteca Virtual de Ciencias Sociales de Am□rica Latina
>> y el Caribe de la red de centros miembros de CLACSO
>> Av. Callao 875, 3ro. E
>> (C1023 AAB) Buenos Aires, Argentina
>> Tel.: (54-11) 4814-2301/4811-6588
>> Fax: (54-11) 4812-8459
>> http://www.clacso.org/wwwclacso/espanol/html/biblioteca/fbiblioteca.html
>>
>>
>>
>>
>> _______________________________________________
>> greenstone-users mailing list
>> greenstone-users@list.scms.waikato.ac.nz
>> https://list.scms.waikato.ac.nz/mailman/listinfo/greenstone-users
>>

Dra. Dominique Babini
Coordinadora Area Informaci□n
dbabini@campus.clacso.edu.ar

Consejo Latinoamericano de Ciencias Sociales - CLACSO
Biblioteca Virtual de Ciencias Sociales de Am□rica Latina
y el Caribe de la red de centros miembros de CLACSO
Av. Callao 875, 3ro. E
(C1023 AAB) Buenos Aires, Argentina
Tel.: (54-11) 4814-2301/4811-6588
Fax: (54-11) 4812-8459
http://www.clacso.org/wwwclacso/espanol/html/biblioteca/fbiblioteca.html