期刊
JOURNAL OF DOCUMENTATION
卷 60, 期 5, 页码 493-502出版社
EMERALD GROUP PUBLISHING LIMITED
DOI: 10.1108/00220410410560573
关键词
information research; information retrieval; information science and documentation
The exhaustivity of document descriptions and the specificity of index terms are usually regarded as independent It is suggested that specificity should be interpreted statistically, as a function of term use rather than of term meaning. The effects on retrieval of variations in term specificity are examined, experiments with three test collections showing, in particular, that frequently-occurring terms are required for good overall performance. It is argued that terms should be weighted according to collection frequency, so that matches on less frequent, more specific, terms are of greater value than matches on frequent terms. Results for the test collections show that considerable improvements in performance are obtained with this very simple procedure.
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