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Chan, L.M.; Vizine-Goetz, D.: Errors and obsolete elements in assigned Library of Congress Subject Headings : implications for subject cataloging and subject authority control (1997) 0.00

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Abstract: An analysis of a sample of 9.442 headings assigned by the LoC to bibliographic records disclosed 2 types of invalid headings: those that were erroneous and those that were obsolete. Each type revealed recurring patterns. Errors and obsolete elements occuring in assigned heading involve MARC coding, terminology in main headings and subdivisions, application of subdivisions, and in mechanical elements such as punctuation and capitalization. Different headings (e.g. personal name, corporate name, topical, etc.) display different patterns as well as predominance of errors and obsoleteness. Although the overall error rate is low, an awareness and understanding of patterns of errors and obsolescnce in subject heading strings should contribute to improvement in subject heading assignment and subject authority control
Source: Library resources and technical services. 41(1997) no.4, S.295-322

Chan, L.M.: Subject access systems in the USA (1995) 0.00

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Pages: S.181-212
Source: Subject indexing: principles and practices in the 90's. Proceedings of the IFLA Satellite Meeting Held in Lisbon, Portugal, 17-18 August 1993, and sponsored by the IFLA Section on Classification and Indexing and the Instituto da Biblioteca Nacional e do Livro, Lisbon, Portugal. Ed.: R.P. Holley et al

Chan, L.M.: Functions of a subject authority file (1991) 0.00

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Pages: S.9-30
Source: Subject authorities in the online environment: papers from a conference program held in San Francisco, 29.6.1987. Ed.: K.M. Drabenstott

Chan, L.M.; Hodges, T.: Subject cataloguing and classification : the late 1980s and beyond (1990) 0.00

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Abstract: The chapter deals with methods of subject cataloguing, subject analysis and representation of library materials and outlines the practice of subject searching in library catalogs after the introduction of online catalogs. The vocabulary control methods in the Library of Congress Classification and LCSH are described and strategies for the use of theses systems in online retrieval situations are outlined
Pages: S.74-85

Chan, L.M.: Classification present and future (1995) 0.00

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Abstract: Suggests that recent developments in the way information is generated, packaged amd accessed have broadened and changed the nature and application of classification in library and information networks. Examines the role of classification by posing the following questions: what, how and why do we classify? Within this context the expanding role of classification is examined with regard to how classification affects accessing, browsing, identifying, navigating, mapping and evaluating information and how it is and may be used in collection and database management, controlled vocabulary construction and development, and research
Footnote: Paper presented at the 36th Allerton Institute, 23-25 Oct 94, Allerton Park, Monticello, IL: "New Roles for Classification in Libraries and Information Networks: Presentation and Reports"
Source: Cataloging and classification quarterly. 21(1995) no.2, S.5-17

Chan, L.M.: Dewey Decimal Classification : Edition 21 and international perspectives. Opening remarks (1997) 0.00

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Abstract: In respect to the nature and quantity of available information, 1876 was a very different world from the one we know in the 1990s. Yet in spite of over a century of changes, the Dewey Decimal Classification (DDC), the system that helped organize a small college library, has grown to one that is helping the whole world organize its vast store of information resources. In this closing session, I would like to summarize some of the major factors that have contributed so far to the Dewey system's success as an information organization tool. I will also discuss ongoing efforts to ensure its viability in the future
Pages: S.1-2

Chan, L.M.: ¬The Library of Congress Classification System in an online environment (1990) 0.00

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Footnote: Paper presented at the 2nd Annette Lewis Phinazee Symposium on Classification as an enhancement of intellectual access to information in an online environment, held at the School of Library and Information Sciences, North Carolina Central University, Durham, North Carolina.
Source: Cataloging and classification quarterly. 11(1990) no.1, S.7-25

Chan, L.M.: Library of Congress Classification : alternative provisions (1995) 0.00
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Abstract

The Library of Congress Classification (LCC), being a system originally and specifically designed for the Library's own collection, generally eschews alternatives. Within the LCC schedules, alternatives are found occasionally in earlier editions; there are no alternative numbers in recently developed or revised schedules. On the other hand, many alternative numbers representing different treatment of specific types of materials such as bibliographies and monographic series are provided in LC MARC records. Such numbers may be used by other libraries that prefer the alternative treatment. In addition, many LC MARC records also include class or call numbers based on other classification schemes, including the Dewey Decimal Classification (DDC), the National Library of Medicine Classification (NLM), and the Superintendent of Documents Classification. The alternative class numbers assigned from other classification systems are provided as services to libraries not using the Library of Congress Classification.

Pages

S.67-88
Chan, L.M.; Vizine-Goetz, D.: Towards a computer-generated subject validation file : feasibility and usefulness (1998) 0.00
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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

Source

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

Chan, L.M.; Vizine-Goetz, D.: Feasibility of a computer-generated subject validation file based on frequency of occurrence of assigned LC Subject Headings (1995) 0.00

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Source: Annual review of OCLC research. 1995, S.46-50

Chan, L.M.: Subject analysis tools online : the challenge ahead (1990) 0.00

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Source: Information technology and libraries. 9(1990), S.259-262

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