Document (#29422)

Author
Sparck Jones, K.
Title
¬A statistical interpretation of term specificity and its application in retrieval
Source
Journal of documentation. 60(2004) no.5, S.493-502
Year
2004
Abstract
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.
Footnote
Vgl. auch unter: http://www.emeraldinsight.com/10.1108/00220410410560573.
Theme
Retrievalalgorithmen

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  5. Aizawa, A.: ¬An information-theoretic perspective of tf-idf measures (2003) 0.20
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