FIRST LETTER FREQUENCY OF RELATED TERM REFERENCES IN FOUR TECHNICAL THESAURI
CHEMICAL RESEARCH AND DEVELOPMENT LABS EDGEWOOD ARSENAL MD
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The method was to compare the first letter frequencies in the thesauri with each other, with the first letter frequencies of their descriptors, and with the pattern noted by other investigators. The thesauri selected were The Engineers Joint Council Thesaurus of Engineering Terms EJC, the Defense Documentation Centers Thesaurus of Astia Descriptors ASTIA, the Medical Subject Headings of the National Library of Medicine MESH and the Medical and Health Related Sciences Thesaurus of the Public Health Service MHRST. The related terms did not follow the first letter frequency pattern of their own descriptors or of that reported in the literature. The principal difference was in redundancy of letters within their own letter section. The thesauri were fairly consistent in this difference. In addition to word redundancy, there seemed to be an additional factor resulting in the redundancy.
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