Document (#19782)

Author

Chan, L.M.
Vizine-Goetz, D.

Title

Towards a computer-generated subject validation file : feasibility and usefulness

Source

Library resources and technical services. 42(1998) no.1, S.45-60

Year

1998

Abstract

Recognition, by libraries, of the need for improved efficiency and reliability in subject authority control in catalogues led to a study of the feasibility of automatically creating a subject heading validation file by scanning the OLUC. The premises were: that although the file would not be axhaustive, it would contain the majority of frequently used headings; and that the predicted level of accurary in the file would be high. A sample file of Library of Congress assigned subject headings, from the OCLC Subject Headings Corrections database was analyzed. Results showed that: the frequency of use varies inversely with the number of headings at a given rrate of use; a small number of headings with high frequencies of use accounts for the majority of total use, while a large proportion shows very low frequency of use; topical headings account for 2/3 of assigned headings; and error and obsolescence rates are both low and are in inverse relationship to the frequency of heading use. Concludes that an automatically generated subject heading validation file is feasible and could serve various purposes, including: verification of subject heading strings constructed by cataloguers; updating of subject headings in catalogue maintenance; and validation of subject headings during retrospective catalogue conversion

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4. Drabenstott, K.M.: ¬The need for machine-readable authority records for topical subdivisions (1992) 0.27

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5. Lu, S.-j.: ¬A study on Chinese subject headings (1997) 0.27

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