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Analysis of Zipf's Law: An Index Approach.
Peer reviewed Peer reviewed
Chen, Ye-Sho; Leimkuhler, Ferdinand F. – Information Processing and Management, 1987
This analysis of Zipf's law uses an index for the sequence of observed values of the variables in a Zipf-type relationship. Three important properties relating rank, count, and frequency are identified, shapes of Zipf-type curves are described, and parameters of the Mandelbrot-Zipf law are discussed. (Author/LRW)
Descriptors: Indexing, Mathematical Models, Predictor Variables, Statistical Distributions
Relative Indexing. Weighted Descriptors and Relative Indexing in a Document Retrieval System Model.
Peer reviewed Peer reviewed
Choros, Kazimierz; Danilowicz, Czeslaw – Information Processing and Management, 1982
Discusses methods of weighting of descriptors in document search patterns together with the concept of relative indexing and conditions which should be satisfied by descriptor weight. A procedure for modifiying document search patterns based on users' informational needs and opinions is outlined, and examples are given. Sixteen references are…
Descriptors: Algorithms, Indexing, Information Retrieval, Information Seeking
Query Term Weights as Constraints in Fuzzy Information Retrieval.
Peer reviewed Peer reviewed
Bordogna, G; And Others – Information Processing and Management, 1991
Presents an analytical approach to the interpretation of weighted Boolean queries. By distinguishing query term weights from query weights, a query becomes a means of describing classes of ideal documents and expressing relativity criteria among these descriptions. A formalization of query term weights is given in a fuzzy set theoretical context.…
Descriptors: Evaluation Criteria, Indexing, Information Retrieval, Information Science
An Analytic Measure Predicting Information Retrieval System Performance.
Peer reviewed Peer reviewed
Losee, Robert M. – Information Processing and Management, 1991
Provides a method for estimating precision without examining individual database documents, which requires knowledge of only the query or expressed information need and a set of database parameters constant for all queries. Concepts of historic and expected precision are examined, and applications of precision-document graphs are assessed. (36…
Descriptors: Evaluation Criteria, Expert Systems, Hypermedia, Indexing
Applying Informetric Characteristics of Databases to IR System File Design, Part I: Informetric Models.
Peer reviewed Peer reviewed
Wolfram, Dietmar – Information Processing and Management, 1992
Examines how informetric characteristics of information retrieval (IR) system databases can be used to help system designers decide what type of file structures would provide the best performance. The development of appropriate models describing database contents is highlighted in this first part of a two-part study. (30 references) (LRW)
Descriptors: Computer System Design, Database Design, Databases, Foreign Countries
Applying Informetric Characteristics of Databases to IR System File Design, Part II: Simulation Comparisons.
Peer reviewed Peer reviewed
Wolfram, Dietmar – Information Processing and Management, 1992
This second report on a two-part study on the application of informetrics to information retrieval (IR) system design used models of database contents in a factorial simulation study at the University of Western Ontario. The study explored whether different file structures were better suited for different informetric environments. (32 references)…
Descriptors: Analysis of Variance, Comparative Analysis, Computer Simulation, Computer System Design