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Bak, Peter; Meyer, Joachim – Behaviour & Information Technology, 2011
Information systems increasingly provide options for visually inspecting data during the process of information discovery and exploration. Little research has dealt so far with user interactions with these systems, and specifically with the effects of characteristics of the displayed data and the user on performance with such systems. The study…
Descriptors: Foreign Countries, Graphs, Criteria, Information Retrieval
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Bernstein, Lionel M.; Williamson, Robert E. – Journal of the American Society for Information Science, 1984
The Hepatitis Knowledge Base (text of prototype information system) was used for modifying and testing "A Navigator of Natural Language Organized (Textual) Data" (ANNOD), a retrieval system which combines probabilistic, linguistic, and empirical means to rank individual paragraphs of full text for similarity to natural language queries…
Descriptors: Algorithms, Databases, Graphs, Information Retrieval
McWeeney, Mark G. – 1978
The costs of creating and maintaining permanent files and retrieving keyword title indexes in TRIAL (Technique for Retrieving Information from Abstracts of Literature) are presented. This system, which is used for bibliographic control and file efficiency, is relatively easy to learn and use, and popular with school, academic, business, and…
Descriptors: Comparative Analysis, Cost Effectiveness, Costs, Databases
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Willett, Peter – Information Processing and Management, 1985
Reports algorithm for calculation of term discrimination values that is sufficiently fast in operation to permit use of exact values. Evidence is presented to show that relationship between term discrimination and term frequency is crucially dependent upon type of inter-document similarity measure used for calculation of discrimination values. (13…
Descriptors: Algorithms, Graphs, Information Retrieval, Information Systems
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Smith, F. J.; Devine, K. – Information Processing and Management, 1985
Zipfian laws for frequency distributions of word pairs and longer phrases are derived from text sample analysis. From crossing of Zipfian curves, it is deduced that number of multi-word phrases that occur frequently in text is surprisingly small, of same order of magnitude as number of individual word-types. (8 references) (EJS)
Descriptors: Algorithms, Graphs, Indexing, Information Retrieval
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Fischhoff, Baruch; MacGregor, Donald – Journal of the American Society for Information Science, 1986
Reports on study that used set of measures for characterizing performance with different databases and set of hypotheses for predicting search difficulties based on cognitive processes involved in decision-making aspects of information search. Highlights include confidence assessment, system design criteria, transparency, metatransparency, and…
Descriptors: Databases, Decision Making, Graphs, Information Systems
Harvard Univ., Cambridge, MA. Program on Information Technologies and Public Policy. – 1975
Because the volume of information circulating in our society has proliferated since World War II and become increasingly subject to processing by electronic hardware, the public has a vital interest in knowing how information performs, how its flow is controlled, and on what terms it is made available to the public. Since all information systems…
Descriptors: Annual Reports, Graphs, Information Dissemination, Information Networks