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Documentation Note: Specificity and Weighted Retrieval
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Robertson, S. E. – Journal of Documentation, 1974
Poses questions concerning methods of using specificity information in a weighting scheme. (JB)
Descriptors: Documentation, Information Retrieval, Mathematical Models, Relevance (Information Retrieval)
The Anomalous Behavior of Precision in the Swets Model, and its Resolution
Peer reviewed Peer reviewed
Bookstein, Abraham – Journal of Documentation, 1974
A model for an information retrieval system in which recall and precision are inversely related is described, and then the anomaly is resolved. (PF)
Descriptors: Information Retrieval, Mathematical Models, Models, Recall (Psychology)
A Statistical Analysis of Retrieval Tests: A Bayesian Approach
Peer reviewed Peer reviewed
Robertson, S. E.; Teather, D. – Journal of Documentation, 1974
A model is proposed to explain the retrieval characteristics of an information retrieval system. (Author)
Descriptors: Bayesian Statistics, Information Retrieval, Information Systems, Mathematical Models
An Extension of the Signal Detection Model of Information Retrieval.
Peer reviewed Peer reviewed
Hutchinson, T. P. – Journal of Documentation, 1978
Suggests that a possible reason for receiver-operating characteristics (ROC) curves having a slope other than unity when plotted on Normal-deviate axes is that the dichotomy into relevant and nonrelevant items is artificial, and that there is really a bivariate distribution of objective relevance and relevance as assessed by the information…
Descriptors: Information Retrieval, Information Systems, Mathematical Models, Performance Criteria
Foundation of Evaluation
Peer reviewed Peer reviewed
Van Rijsbergen, C. J. – Journal of Documentation, 1974
The mathematical theory of measurement is used to construct a framework for the evaluation of information retrieval strategies. (Author)
Descriptors: Evaluation Methods, Information Retrieval, Mathematical Models, Measurement
Probabilistic Automatic Indexing by Learning from Human Indexers.
Peer reviewed Peer reviewed
Robertson, S. E.; Harding, P. – Journal of Documentation, 1984
Presents adaptation of a probabilistic theoretical model previously used in relevance feedback for use in automatic indexing of documents (in the sense of imitating) human indexers. Methods for model application are proposed, independence assumptions used in the model are interpreted, and the probability of a dependence model is discussed.…
Descriptors: Automatic Indexing, Classification, Information Retrieval, Mathematical Models
Using Probabilistic Models of Document Retrieval without Relevance Information.
Peer reviewed Peer reviewed
Croft, W. B.; Harper, D. J. – Journal of Documentation, 1979
Retrieval experiments with the Cranfield collection of 1,400 documents used strategies based on a probabilistic model for an initial search and intermediate search when no relevant documents were known. Results show initial strategy is better than conventional strategies in retrieval effectiveness and number of queries needed to retrieve…
Descriptors: Information Retrieval, Mathematical Models, Online Systems, Probability
The Relationship Between Documents Read and Relevant References Retrieved as Effectiveness Measures for Information Retrieval Systems.
Peer reviewed Peer reviewed
Lantz, Brian E. – Journal of Documentation, 1981
Data on 2,380 searches of online information retrieval systems are analyzed using a mathematical model to determine the relationship between two measures of effectiveness--documents read and relevant references. The nature and relative merits of these two variables are discussed, as well as the findings, and seven references are listed. (RBF)
Descriptors: Foreign Countries, Goodness of Fit, Graphs, Information Retrieval
Mathematics and Information Retrieval.
Peer reviewed Peer reviewed
Salton, Gerald – Journal of Documentation, 1979
Examines the main mathematical approaches to information retrieval, including both algebraic and probabilistic models, and describes difficulties which impede formalization of information retrieval processes. A number of developments are covered where new theoretical understandings have directly led to improved retrieval techniques and operations.…
Descriptors: Algebra, Bibliographies, Information Retrieval, Mathematical Models
On a Probabilistic Approach to Determining the Similarity between Boolean Search Request Formulations.
Peer reviewed Peer reviewed
Radecki, Tadeusz – Journal of Documentation, 1982
Presents and discusses the results of research into similarity measures for search request formulations which employ Boolean combinations of index terms. The use of a weighting mechanism to indicate the importance of attributes in a search formulation is described. A 16-item reference list is included. (JL)
Descriptors: Information Retrieval, Mathematical Models, Measurement Techniques, Probability
Inclusion of Relevance Information in the Term Discrimination Model.
Peer reviewed Peer reviewed
Biru, Tesfaye; And Others – Journal of Documentation, 1989
Discusses the effect of including relevance data on the calculation of term discrimination values in bibliographic databases. Algorithms that calculate the ability of index terms to discriminate between relevant and non-relevant documents are described and tested. The results are discussed in terms of the relationship between term frequency and…
Descriptors: Algorithms, Automatic Indexing, Bibliographic Databases, Mathematical Models