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Ranking Techniques and the Empirical Log Law.
Peer reviewed Peer reviewed
Brookes, Bertram C. – Information Processing and Management, 1984
Four empirical laws of bibliometrics--anomalous number, Lotka's, Zipf's, and Bradford's--together with Laplace's "law of succession" and de Solla Price's cumulative advantage distribution are shown to be almost identical. A simple model shows that the frequency forms conform with inverse square law over appropriate interval. (Fifteen…
Descriptors: Equations (Mathematics), Graphs, Information Science, Models
Assessing Scientific Performance.
Peer reviewed Peer reviewed
Weiner, John M.; And Others – Information Processing and Management, 1984
A method for assessing scientific performance based on relationships displayed numerically in published documents is proposed and illustrated using published documents in pediatric oncology for the period 1979-1982. Contributions of a major clinical investigations group, the Childrens Cancer Study Group, are analyzed. Twenty-nine references are…
Descriptors: Cancer, Citations (References), Graphs, Innovation
An Investigation of Document Partitions.
Peer reviewed Peer reviewed
Shaw, W. M., Jr. – Information Processing and Management, 1986
Empirical significance of document partitions is investigated as a function of index term-weight and similarity thresholds. Results show the same empirically preferred partitions can be detected by two independent strategies: an analysis of cluster-based retrieval analysis and an analysis of regularities in the underlying structure of the document…
Descriptors: Automatic Indexing, Graphs, Information Retrieval, Relevance (Information Retrieval)
Predicting Document Retrieval System Performance: An Expected Precision Measure.
Peer reviewed Peer reviewed
Losee, Robert M., Jr. – Information Processing and Management, 1987
Describes an expected precision (EP) measure designed to predict document retrieval performance. Highlights include decision theoretic models; precision and recall as measures of system performance; EP graphs; relevance feedback; and computing the retrieval status value of a document for two models, the Binary Independent Model and the Two Poisson…
Descriptors: Documentation, Feedback, Graphs, Information Retrieval
Psychological Perspectives for Software Science.
Peer reviewed Peer reviewed
Curtis, B.; And Others – Information Processing and Management, 1984
Discusses current use of psychological theory in software science and reviews recent developments in cognitive psychology relevant to programing (human information processing, expert-novice differences). Critique of Maurice Halstead's model of cognitive aspects of programing and a structured data flow perspective (control flow and data flow…
Descriptors: Cognitive Processes, Computer Software, Graphs, Models
An Algorithm for the Calculation of Exact Term Discrimination Values.
Peer reviewed Peer reviewed
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
Storing and Retrieving Word Phrases.
Peer reviewed Peer reviewed
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