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Indexing consistency in MEDLINE.

M E Funk, C A Reid

    Bulletin of the Medical Library Association
    |April 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Indexing consistency in MEDLINE was measured using Hooper's equation. Checktags showed the highest consistency, while Medical Subject Headings (MeSH) consistency varied with concept centrality and subheading attachment.

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    Area of Science:

    • Bibliometrics
    • Information Science
    • Medical Informatics

    Background:

    • Direct measurement of bibliographic database indexing quality is challenging due to the absence of a single "correct" indexing method.
    • Indexing consistency serves as a reliable proxy for evaluating the reliability of indexing processes in bibliographic databases.

    Purpose of the Study:

    • To assess the indexing consistency within the MEDLINE database.
    • To identify factors influencing the consistency of indexing in MEDLINE.

    Main Methods:

    • A total of 760 articles, indexed twice within the MEDLINE database across 42 periodical issues, were selected for comparison.
    • Indexing consistency was quantified using Hooper's equation, expressed as a percentage.
    • Analysis included comparing the consistency of checktags, Medical Subject Headings (MeSH), and subheadings.

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    Main Results:

    • Checktags demonstrated the highest indexing consistency.
    • Medical Subject Headings (MeSH) and subheadings were applied more consistently to central concepts than peripheral ones.
    • The addition of subheadings to main headings decreased consistency, while "floating" subheadings were more consistent than attached ones. Journal indexing priority, language, and article length did not impact consistency.

    Conclusions:

    • MEDLINE's indexing demonstrates a high degree of consistency, likely reflecting its advanced controlled vocabulary, quality control, and trained indexers.
    • Specific MeSH terms from categories A, B, and D were associated with high consistency, whereas terms from categories E, F, H, and N were linked to lower consistency.