[Sigcr-l] FWD: defining classification

[Hjørland Birger]

 Dear Martin, 
library clqssifications of course put certain special constrains on
classification. If used in shelving, each book can only be placed in one
place. In catalogues, however multiple classifications are possible. The
specific kind of system, we are talking about classify in different ways.
Bus that is not, I think, a reason to define classification differently, but
to specify some forms of classification. 

kind regards, 

Birger  

-----Original Message-----
From: Marcia Lei Zeng
To: sigcr-l at asis.org
Sent: 06-08-04 18:51
Subject: [Sigcr-l] FWD: defining classification

Tuesday, August 03, 2004 9:02 AM  
From:  martin <martin at ics.forth.gr>    
To:   mzeng <mzeng at kent.edu>  
Cc:   NKOS <NKOS at dli2.nsf.gov>  
Subject:  RE: FWD: [Sigcr-l] defining classification

    Dear Birger,

    The definition below fits somehow with the definition in Knowledge
    Representation.
    To my understanding, library classification systems are narrower:
They try 
in
    addition
    to define a set of disjoint classes, so that each object can be
uniquely
    assigned to
    one most specialized class. So, polyhierarchies and multiple 
classifiaction is
    avoided.

    Best,

    Martin

    mzeng at KENT.EDU wrote:

    >
    >
------------------------------------------------------------------------
    >
    > Subject:
    >
    > [Sigcr-l] defining classification
    > From:
    >
    > ?ISO-8859-1?Q?Hjørland_Birger? <BH at db.dk>
    > Date:
    >
    > Mon, 02 Aug 2004 09:49:30 +0200
    > To:
    >
    > "'lewallep at who.int '" <lewallep at who.int>, "'sigcr-l at asis.org '"
    > <sigcr-l at asis.org>
    >
    >
    > enclosed a relevant source and a quotation from the same
concerning the
    > definition of classification.
    >
    > Kind regards,
    > Birger Hjørland
    >
    >
    >
    >
    >
    > H. Feger (2001). Classification: Conceptions in the Social
Sciences
    > International Encyclopedia of the Social and Behavioral Sciences,
pp.
    > 1966-1973.
    >
    >
    >
    >
    >  Classifiation is the assignment of objects to classes.
    > .....
    > .....
    >   Depending on the research tradition, the objects to be
classified into 
a
    > system are called elements, cases, units, exemplars, specimens or
items.
    > They are the sources or `carriers' of properties, characteristics
or
    > variables. These properties may be dichotomous or polytomous, 
qualitative or
    > quantitative. A property can only be useful in a classification,
if it
    > varies within the set of objects, that is, if at least two
different 
values
    > (categories, states, labels) on the respective property occur in
the 
sample.
    > When more than one property is used to characterize an object, the

object
    > can be described as a vector of values, a profile, a set of
symptoms, or 
a
    > pattern of features.    The crucial assumption underlying
classification 
is
    > that objects are elements of a class, of a set, of a partition
or-in
    > biology-of a taxon. In other terminologies, the terms `category'
or
    > `cluster' are also used.
    >
    > Classification is the process of finding classes and of assigning 
entities
    > to these classes. The endproduct of this order-creating process, 
however, is
    > often also referred to as `classification.' To stress this
distinction, 
the
    > term `classification system' can be used for the end-product,
although 
in
    > clinical psychology and biology the word `taxonomy' is more
common.
    > Identification is the assignment of a specific case or object to 
(usually
    > only) one of the classes.
    >
    >
    > -----Original Message-----
    > From: lewallep at who.int
    > To: sigcr-l at asis.org
    > Sent: 30-07-04 09:14
    > Subject: [Sigcr-l] FW: Seeking definition
    >
    > The World Health Organization is active in developing and
maintaining
    > such
    > classifications as, i.a. the International Classification of
Diseases
    > (ICD),
    > the International Classification of Functioning, disability and
Health
    > (ICF)
    > and the International Classification of Health Interventions
(ICHI).
    > They
    > are used essentially for statistical purposes (epidemiology) and
for
    > health
    > system management purposes (planning and resource allocation).
    > The question was raised recently by a group of collaborating
centres
    > from
    > various countries as to a proper definition of classification.
Scores of
    > definitions have been collected from a variety of sources.
Partners have
    > their own preferences and reservations about each of them. Could
anybody
    > assist in selecting one matching the end products that the
community of
    > Member States have endorsed as international public goods.
    > Thanks.
    > World Health Organization, Geneva
    > Pierre Lewalle
    > Measurements and Health Information (MHI)
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    --

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      Dr. Martin Doerr              |  Vox:+30(2810)391625        |
      Principle Researcher          |  Fax:+30(2810)391638        |
                                    |  Email: martin at ics.forth.gr |
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                    Center for Cultural Informatics               |
                    Information Systems Laboratory                |
                     Institute of Computer Science                |
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