Search (4 results, page 1 of 1)

0.036320746 = product of:
  0.07264149 = sum of:
    0.07264149 = sum of:
      0.037279427 = weight(_text_:p in 5135) [ClassicSimilarity], result of:
        0.037279427 = score(doc=5135,freq=2.0), product of:
          0.18768665 = queryWeight, product of:
            3.5955126 = idf(docFreq=3298, maxDocs=44218)
            0.052200247 = queryNorm
          0.19862589 = fieldWeight in 5135, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5955126 = idf(docFreq=3298, maxDocs=44218)
            0.0390625 = fieldNorm(doc=5135)
      0.035362065 = weight(_text_:22 in 5135) [ClassicSimilarity], result of:
        0.035362065 = score(doc=5135,freq=2.0), product of:
          0.18279637 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.052200247 = queryNorm
          0.19345059 = fieldWeight in 5135, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.0390625 = fieldNorm(doc=5135)
  0.5 = coord(1/2)

Date

22. 3.2008 16:18:27

0.026897965 = sum of:
  0.011986194 = product of:
    0.047944777 = sum of:
      0.047944777 = weight(_text_:authors in 4041) [ClassicSimilarity], result of:
        0.047944777 = score(doc=4041,freq=2.0), product of:
          0.23797122 = queryWeight, product of:
            4.558814 = idf(docFreq=1258, maxDocs=44218)
            0.052200247 = queryNorm
          0.20147301 = fieldWeight in 4041, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            4.558814 = idf(docFreq=1258, maxDocs=44218)
            0.03125 = fieldNorm(doc=4041)
    0.25 = coord(1/4)
  0.014911771 = product of:
    0.029823542 = sum of:
      0.029823542 = weight(_text_:p in 4041) [ClassicSimilarity], result of:
        0.029823542 = score(doc=4041,freq=2.0), product of:
          0.18768665 = queryWeight, product of:
            3.5955126 = idf(docFreq=3298, maxDocs=44218)
            0.052200247 = queryNorm
          0.15890071 = fieldWeight in 4041, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5955126 = idf(docFreq=3298, maxDocs=44218)
            0.03125 = fieldNorm(doc=4041)
    0.5 = coord(1/2)

Abstract

Class-tested and coherent, this textbook teaches information retrieval, including web search, text classification, and text clustering from basic concepts. Ideas are explained using examples and figures, making it perfect for introductory courses in information retrieval for advanced undergraduates and graduate students. Slides and additional exercises are available for lecturers. - This book provides what Salton and Van Rijsbergen both failed to achieve. Even more important, unlike some other books in IR, the authors appear to care about making the theory as accessible as possible to the reader, on occasion including short primers to certain topics or choosing to explain difficult concepts using simplified approaches. Its coverage [is] excellent, the quality of writing high and I was surprised how much I learned from reading it. I think the online resources are impressive.

0.011183828 = product of:
  0.022367656 = sum of:
    0.022367656 = product of:
      0.044735312 = sum of:
        0.044735312 = weight(_text_:p in 4332) [ClassicSimilarity], result of:
          0.044735312 = score(doc=4332,freq=2.0), product of:
            0.18768665 = queryWeight, product of:
              3.5955126 = idf(docFreq=3298, maxDocs=44218)
              0.052200247 = queryNorm
            0.23835106 = fieldWeight in 4332, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5955126 = idf(docFreq=3298, maxDocs=44218)
              0.046875 = fieldNorm(doc=4332)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

0.0037279427 = product of:
  0.0074558854 = sum of:
    0.0074558854 = product of:
      0.014911771 = sum of:
        0.014911771 = weight(_text_:p in 442) [ClassicSimilarity], result of:
          0.014911771 = score(doc=442,freq=2.0), product of:
            0.18768665 = queryWeight, product of:
              3.5955126 = idf(docFreq=3298, maxDocs=44218)
              0.052200247 = queryNorm
            0.079450354 = fieldWeight in 442, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5955126 = idf(docFreq=3298, maxDocs=44218)
              0.015625 = fieldNorm(doc=442)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Footnote

Rez. in: JASIST 58(2007) no.4, S.608-609 (K.D. Desouza): "Richard Rogers explores the distinctiveness of the World Wide Web as a politically contested space where information searchers may encounter multiple explanations of reality. Sources of information on the Web are in constant competition with each other for attention. The attention a source receives will determine its prominence, the ability to be a provider of leading information, and its inclusion in authoritative spaces. Rogers explores the politics behind evaluating sources that are collected and housed on authoritative spaces. Information politics on the Web can be looked at in terms of frontend or back-end politics. Front-end politics is concerned with whether sources on the Web pay attention to principles of inclusivity, fairness, and scope of representation in how information is presented, while back-end politics examines the logic behind how search engines or portals select and index information. Concerning front-end politics, Rogers questions the various versions of reality one can derive from examining information on the Web, especially when issues of information inclusivity and scope of representation are toiled with. In addition, Rogers is concerned with how back-end politics are being controlled by dominant forces of the market (i.e., the more an organization is willing to pay, the greater will be the site's visibility and prominence in authoritative spaces), regardless of whether the information presented on the site justifies such a placement. In the book, Rogers illustrates the issues involved in back-end and front-end politics (though heavily slanted on front-end politics) using vivid cases, all of which are derived from his own research. The main thrust is the exploration of how various "information instruments," defined as "a digital and analytical means of recording (capturing) and subsequently reading indications of states of defined information streams (p. 19)," help capture the politics of the Web. Rogers employs four specific instruments (Lay Decision Support System, Issue Barometer, Web Issue Index of Civil Society, and Election Issue Tracker), which are covered in detail in core chapters of the book (Chapter 2-Chapter 5). The book is comprised of six chapters, with Chapter 1 being the traditional introduction and Chapter 6 being a summary of the major concepts discussed.