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| Models | 2 |
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| Information Systems | 1 |
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| Journal of the American… | 2 |
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Peer reviewedEgghe, L. – Journal of the American Society for Information Science, 1997
Proves price index (proportion of references within the last five years of literature) is not a pure function of the mean or median reference age, but a well-defined relation in the form of a typical cloud of points. Compares models for analyzing price index (decreasing exponential and lognormal aging) and explains cloud using results from…
Descriptors: Citations (References), Comparative Analysis, Cost Indexes, Functions (Mathematics)
Peer reviewedCooper, William S. – Journal of the American Society for Information Science, 1983
Presents information retrieval design approach in which queries of computer-based system consist of sets of terms, either unweighted or weighted with subjective term precision estimates, and retrieval outputs ranked by probability of usefulness estimated by "maximum entropy principle." Boolean and weighted request systems are discussed.…
Descriptors: Information Retrieval, Information Systems, Models, Online Systems
