Query Expansion with Long-Span Collocates   总被引：1，自引：0，他引：1  

Olga Vechtomova  Stephen Robertson  Susan Jones 《Information Retrieval》2003,6(2):251-273

The paper presents two novel approaches to query expansion with long-span collocates—words, significantly co-occurring in topic-size windows with query terms. In the first approach—global collocation analysis—collocates of query terms are extracted from the entire collection, in the second—local collocation analysis—from a subset of retrieved documents. The significance of association between collocates was estimated using modified Mutual Information and Z score. The techniques were tested using the Okapi IR system. The effect of different parameters on performance was evaluated: window size, number of expansion terms, measures of collocation significance and types of expansion terms. We present performance results of these techniques and provide comparison with related approaches.  相似文献   

Statistics Going to the Dogs     

Stephen R. Clarke  Anthony B. Bedford 《Teaching Statistics》2002,24(1):6-9

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An intellectual utility for science and technology: The national research and education network     

Stephen B. Gould 《Government Information Quarterly》1990,7(4)

This article will provide a brief overview of the primary computer network structures serving the U.S. academic research community. Plans for transforming the Internet into a National Research and Education Network are moving forward under the leadership of the National Science Foundation and the Federal Research Internet Coordinating Committee. The article outlines the scope of computational and information resources likely to be available to users through the national network, and highlights the role envisioned for the network in facilitating effective remote interaction by researchers with colleagues, scientific instruments, and data. When fully implemented, the national network can serve both as a powerful utility that extends the capabilities of scholars, scientists, and engineers, and as a testbed for an electronic information infrastructure available to every home, office and factory in the United States in the 21st century.  相似文献   

The Case for Antiracist Education     

Stephen May 《British Journal of Sociology of Education》1994,15(3):421-428

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A perspective on due process in teacher evaluation     

Julianne Coleman  Stephen T. Schroth  Lisa Molinaro  Mark Green 《Journal of Personnel Evaluation in Education》1988,2(1):53-57

A perspective on due process in teacher evaluation  相似文献   

What do the translators think they are up to?     

Stephen Prickett 《Higher Education Quarterly》1979,33(3):259-268

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Microcomputer infusion project: A model     

Stephen A. Rossberg  Gary G. Bitter 《TechTrends》1988,33(5):24-28

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SUSTAINING AND RESPONDING TO CHARGES OF BIAS IN CRITICAL THINKING     

Stephen P. Morris 《Educational theory》1995,45(2):199-211

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NCME Members' Suggestions for Recruiting New Measurement Professionals     

Stephen G. Sireci  Shameem Nyla Khaliq 《Educational Measurement》2002,21(3):19-24

During February and March 2001, a survey on ideas for recruiting new educational measurement professionals was posted on the website of the National Council on Measurement in Education  相似文献   

A framework for the analysis of teachers' demand and supply     

Anthony E. Boardman  Linda Darling-Hammond  Stephen P. Mullin 《Economics of Education Review》1982,2(2):127-155

This article develops a general framework for the analysis of education finance reforms. Most of the recent literature concentrates o on the demands and ignores the costs of educational services. Proposed reforms that account for different costs assume that the supply of all educational inputs are infinitely price elastic. The article presents a model for the supply of different types of teachers and an optimization model of the school district which maximizes a general welfare function subject to production function and budget constraints. Derived demand equations are obtained under the assumptions of (1) perfect competition, (2) monopsony, and (3) monopsony plus endogenous property tax rates. The equations are simplified and estimated using data from Pennsylvania school districts. A major policy implication for school finance reform is that present schemes for state equalization aid may be fundamentally flawed because they do not properly account for the effects of demand shifts (with upward sloping supply curves) on education input prices.  相似文献