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| Algorithms | 3 |
| Information Retrieval | 3 |
| Thesauri | 3 |
| Documentation | 2 |
| Artificial Intelligence | 1 |
| Classification | 1 |
| Computer Simulation | 1 |
| Databases | 1 |
| Evaluation Methods | 1 |
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| Rada, Roy | 3 |
| Bicknell, Ellen | 1 |
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| Journal Articles | 3 |
| Reports - Research | 3 |
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Peer reviewedRada, Roy; Bicknell, Ellen – Journal of the American Society for Information Science, 1989
Describes exploratory experiments in evaluating and improving a thesaurus through studying its effect on retrieval. A formula was developed to measure the conceptual distance between queries and documents encoded as sets of thesaurus terms. Comparison to the performance of people judging conceptual distance shows that the formula accurately…
Descriptors: Algorithms, Computer Simulation, Evaluation Methods, Indexing
Peer reviewedRada, Roy – Information Processing and Management, 1987
Reviews aspects of the relationship between machine learning and information retrieval. Highlights include learning programs that extend from knowledge-sparse learning to knowledge-rich learning; the role of the thesaurus; knowledge bases; artificial intelligence; weighting documents; work frequency; and merging classification structures. (78…
Descriptors: Algorithms, Artificial Intelligence, Classification, Documentation
Peer reviewedRada, Roy; And Others – Journal of Documentation, 1991
Describes a study funded by the Commission of the European Community that applied document retrieval algorithms to the "Excerpta Medica" database using the EMTREE thesaurus. Nonhierarchical relations were added to enrich the thesaurus, and document ranking is discussed in terms of the conceptual distance between the documents and the…
Descriptors: Algorithms, Databases, Documentation, Foreign Countries
