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Radford, Alexandria Walton; Fritch, Laura Burns; Leu, Katherine; Duprey, Michael – National Center for Education Statistics, 2018
This report presents selected findings from the second follow-up of the High School Longitudinal Study of 2009 (HSLS:09). HSLS:09 follows a nationally representative sample of students who were ninth-graders in fall 2009 from the beginning of high school into higher education and the workforce. Key research topics for HSLS:09 include secondary to…
Descriptors: High School Students, Longitudinal Studies, Grade 9, Cohort Analysis
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Noma, Elliot; Olivastro, Dominic – Journal of the American Society for Information Science, 1985
A study comparing citations received by patents in given year to number received in subsequent years found that, even though influential patents remain influential, both highly and infrequently cited patents age at same rate. Distribution of patents by number of citations received is stable over time. (17 references) (EJS)
Descriptors: Citations (References), Comparative Analysis, Matrices, Models
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Tague, Jean; Nicholls, Paul – Information Processing and Management, 1987
Examines relationships among the parameters of the Zipf size-frequency distribution as well as its sampling properties. Highlights include its importance in bibliometrics, tables for the sampling distribution of the maximal value of a finite Zipf distribution, and an approximation formula for confidence intervals. (Author/LRW)
Descriptors: Bibliometrics, Least Squares Statistics, Mathematical Models, Research Methodology
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Nelson, Michael J.; Tague, Jean M. – Journal of the American Society for Information Science, 1985
Proposes split model for index term distribution in document set that uses rank function for high frequency terms and size function for low frequency terms; the point of transition is determined either empirically or by rule. Distributions to describe index term exhaustivity and term co-occurrence are considered briefly. (36 references) (EJS)
Descriptors: Databases, Indexing, Information Retrieval, Models
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Sichel, H. S. – Journal of the American Society for Information Science, 1985
The Generalized Inverse Gaussian-Poisson Distribution is suggested as an all-embracing mathematical model for bibliometric frequency distributions. Twelve examples are given which show that the new model cannot be rejected by virtue of an objective chi-squared test. A mathematical appendix and 20 references are included. (Author/EJS)
Descriptors: Authors, Citations (References), Mathematical Models, Productivity
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Brownsey, K. W. R.; Burrell, Q. L. – Journal of Documentation, 1986
Frequency-of-circulation distributions from 16 United Kingdom libraries participating in initial period of operation of the Public Lending Right are discussed. Differences between the libraries are highlighted, and, for each, the adequacy of various refinements of the simplest model (geometric distribution, negative binomial distribution, or mixed…
Descriptors: Books, Childrens Literature, Fiction, Graphs
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Brookes, B. C. – Journal of Documentation, 1984
Review of recent developments in statistical theories for social sciences highlights Haitun's statistical distributions, Laplace's "Law of Succession" and distribution, Laplace and Bradford analysis of book-index data, inefficiency of frequency distribution analysis, Laws of Bradford and Zipf, natural categorization, and Bradford Law and…
Descriptors: Family Income, Graphs, Information Systems, Information Theory
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Pao, Miranda Lee – Information Processing and Management, 1985
A step-by-step outline is presented for testing the applicability of Lotka's law of scientific productivity. Steps include the computation of the values of the exponent and constant based on Lotka's method and the test for significance of observed frequency distribution against the estimated theoretical distribution derived from Lotka's formula.…
Descriptors: Authors, Data Collection, Evaluation Methods, Indexes
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Mahapatra, M.; Biswas, S. C. – International Library Review, 1984
Describes research which measured the efficiency of role operators through frequency of appearances in PRECIS input strings for 200 abstracts related to taxation, genetic psychology, and Shakespearian drama. Frequencies of appearance of major categories of role operators, role operators in different subjects, individual main line operators, and…
Descriptors: Comparative Analysis, Indexing, Information Retrieval, Relevance (Information Retrieval)
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Hawkins, Donald T. – Online Review, 1984
This update of 1978 bibliometric study of online retrieval literature reveals that: literature has continued to grow, reaching peak annual output (504 papers) in 1981; conference literature has become centralized in four major proceedings; online retrieval papers have appeared in 479 journals; and 31 authors have contributed 10 or more papers.…
Descriptors: Authors, Conferences, Graphs, Information Retrieval
Kelsey, J. G. T. – 1983
Effectiveness ratings of principals by researchers have frequently been hampered by relying on teachers' one-dimensional, research-triggered "global" ratings. This paper reports a 1979-80 British Comumbia superintendents' study geared toward multidimensional subjective assessments of 266 administrators, and concentrates primarily on ways…
Descriptors: Administrator Evaluation, Elementary Secondary Education, Evaluation Criteria, Measurement Techniques
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Losee, Robert M. – Journal of the American Society for Information Science, 1988
Describes probabilistic document retrieval systems as a sequential learning process, in which the system learns the parameters of probability distributions describing the frequencies of feature occurrences in relevant and nonrelevant documents. Several techniques for estimating the parameters of distributions are described and the results of tests…
Descriptors: Estimation (Mathematics), Feedback, Information Retrieval, Man Machine Systems
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Cook, Kevin L. – Journal of Academic Librarianship, 1985
Describes methodology for the gathering of useful collection management data and reports results of study which analyzed circulation data and sampled in-library use at a Government Printing Office depository to explore circulation and in-library use frequency distributions, circulation and in-library use, and age of publications used in the…
Descriptors: College Libraries, Depository Libraries, Government Publications, Higher Education
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Trivison, Donna – Information Processing and Management, 1987
Describes study that compared terminology indexing and citation indexing to determine the similarity of documents retrieved. Information science articles from 1971 to 1983 in three journals were studied for term co-occurrences. The distinction between relevant and pertinent documents is discussed, and further research topics are suggested. (LRW)
Descriptors: Bibliographic Coupling, Citation Indexes, Comparative Analysis, Indexing
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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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