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Dissertation Information for LeAnn Garrett

NAME:
- LeAnn Garrett

DEGREE:
- Ph.D.

DISCIPLINE:
- Library and Information Science

SCHOOL:
- University of Hawaii (USA) (1997)

ADVISORS:
- Larry N. Osborne

COMMITTEE MEMBERS:
- Martha E. Crosby
- W. Wesley Peterson
- Hisami Konishi Springer
- Marvin Ellsworth Ortel

MPACT Status: Fully Complete

Title: Authority control and its influence on recall and precision in an online bibliographic catalog

Abstract: Authority control and its influence on information retrieval, as measured by recall and precision, was studied. Three online bibliographic catalogs were constructed. The first catalog used only medical subject headings (MeSH), the second used a 50% combination of MeSH and Library of Congress subject headings (LCSH), and the third used only LCSH. Subject word and keyword searches (in all indexed fields) were performed with the medical subject headings used to develop the catalogs. The average values for recall and precision were then calculated. Using Chebychev's Inequality, 96% confidence intervals were computed to carry out the required hypothesis testing. Results indicate that recall is greater in the MeSH authority controlled catalog for both subject word and keyword searches. Precision is also greater in the MeSH authority controlled catalog for subject word searches. Keyword searches, however, introduce a decrease in precision at the.08 significance level and is no better than searches in the catalogs not using MeSH authority control. The theoretically optimal search of recall = 1.0 and precision = 1.0 was demonstrated in the subject word search in the MeSH authority controlled catalog. When comparing the two non-MeSH authority controlled catalogs, recall is greater at the.08 significance level in the catalog that used a 50% combination of MeSH and LCSH than in the catalog that was indexed only with LCSH. There are no statistically significant results in recall between subject word searches and keyword searches in either of the catalogs not using MeSH authority control. Keyword searching, therefore, cannot be relied on to increase recall. There are no statistically significant results in precision between the two non-MeSH authority controlled catalogs or between subject word and keyword searches. Authority control in online bibliographic catalogs is recommended. In addition to subject word searches, searches in authority controlled fields using authorized headings are recommended as the primary search option.


MPACT Scores for LeAnn Garrett

A = 0
C = 0
A+C = 0
T = 0
G = 0
W = 0
TD = 0
TA = 0
calculated 2008-01-31 06:31:30

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Students under LeAnn Garrett

ADVISEES:
- None

COMMITTEESHIPS:
- None