Automatic Indexing: a State-of-the-art Report
Author | : Mary Elizabeth Stevens |
Publisher | : |
Total Pages | : 300 |
Release | : 1970 |
Genre | : Automatic indexing |
ISBN | : |
Simulating Information Retrieval Test Collections
Author | : David Hawking |
Publisher | : Morgan & Claypool Publishers |
Total Pages | : 186 |
Release | : 2020-09-04 |
Genre | : Science |
ISBN | : 1681739585 |
Simulated test collections may find application in situations where real datasets cannot easily be accessed due to confidentiality concerns or practical inconvenience. They can potentially support Information Retrieval (IR) experimentation, tuning, validation, performance prediction, and hardware sizing. Naturally, the accuracy and usefulness of results obtained from a simulation depend upon the fidelity and generality of the models which underpin it. The fidelity of emulation of a real corpus is likely to be limited by the requirement that confidential information in the real corpus should not be able to be extracted from the emulated version. We present a range of methods exploring trade-offs between emulation fidelity and degree of preservation of privacy. We present three different simple types of text generator which work at a micro level: Markov models, neural net models, and substitution ciphers. We also describe macro level methods where we can engineer macro properties of a corpus, giving a range of models for each of the salient properties: document length distribution, word frequency distribution (for independent and non-independent cases), word length and textual representation, and corpus growth. We present results of emulating existing corpora and for scaling up corpora by two orders of magnitude. We show that simulated collections generated with relatively simple methods are suitable for some purposes and can be generated very quickly. Indeed it may sometimes be feasible to embed a simple lightweight corpus generator into an indexer for the purpose of efficiency studies. Naturally, a corpus of artificial text cannot support IR experimentation in the absence of a set of compatible queries. We discuss and experiment with published methods for query generation and query log emulation. We present a proof-of-the-pudding study in which we observe the predictive accuracy of efficiency and effectiveness results obtained on emulated versions of TREC corpora. The study includes three open-source retrieval systems and several TREC datasets. There is a trade-off between confidentiality and prediction accuracy and there are interesting interactions between retrieval systems and datasets. Our tentative conclusion is that there are emulation methods which achieve useful prediction accuracy while providing a level of confidentiality adequate for many applications.
Subject Analysis Methodologies
Author | : E. D. Dym |
Publisher | : CRC Press |
Total Pages | : 518 |
Release | : 1985-10-01 |
Genre | : Language Arts & Disciplines |
ISBN | : 9780824773540 |
Your choice for a text n document analysis is no longer limited to books containing only one specific method. This workbook of Readings-representing an introductory. state of the art approach to document analysis-combines a full range of subject analysis techniques into a comprehensive, single source volume.
ERIC Educational Documents Index
Author | : Educational Resources Information Center (U.S.) |
Publisher | : |
Total Pages | : 820 |
Release | : 1966 |
Genre | : Education |
ISBN | : |
"A subject-author-institution index which provides titles and accession numbers to the document and report literature that was announced in the monthly issues of Resources in education" (earlier called Research in education).