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Related Experiment Videos

Searching for patterns in the MeSH vocabulary.

J E Backus1, S Davidson, R Rada

  • 1Library Operations, National Library of Medicine, Bethesda, Maryland 20894.

Bulletin of the Medical Library Association
|July 1, 1987
PubMed
Summary

New terms in the National Library of Medicine (NLM) Medical Subject Headings (MeSH) vocabulary cannot be predicted by increased postings of broader terms. Search patterns do not correlate with MeSH tree structure distribution.

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Area of Science:

  • Medical Informatics
  • Library Science
  • Biomedical Information

Background:

  • The National Library of Medicine (NLM) annually updates the Medical Subject Headings (MeSH) vocabulary to align with biomedical literature evolution.
  • Understanding MeSH vocabulary dynamics is crucial for effective biomedical information retrieval and indexing.

Purpose of the Study:

  • To test two hypotheses regarding the NLM's MeSH vocabulary revision process and its relationship with MEDLINE indexing and searching patterns.
  • Hypothesis 1: New MeSH terms are added when their broader terms show increased postings.
  • Hypothesis 2: MEDLINE indexing and searching patterns correlate with the MeSH hierarchical tree structure.

Main Methods:

  • Compared postings of broader terms for new versus existing MeSH terms in the MEDLINE file.

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  • Analyzed postings of broader terms over time for new and existing MeSH terms.
  • Compared the distribution of searched terms within MeSH trees against the overall distribution of all terms.

    • Main Results:

    • No statistically significant difference was found in the number of postings for broader terms of new and existing MeSH terms.
    • The distribution of searched terms in MeSH trees did not correlate with the overall distribution of terms.
    • Certain MeSH trees were searched more or less frequently than predicted by their overall term distribution.

    Conclusions:

    • The addition of new terms to the MeSH vocabulary cannot be reliably predicted by an increase in postings of their broader terms.
    • User search behavior and indexer practices regarding the MeSH tree structure do not align with the hierarchical distribution of terms.