Search (10 results, page 1 of 1)

  • × author_ss:"Robertson, S."
  • × language_ss:"e"
  • × year_i:[2000 TO 2010}
  1. Robertson, S.; Tait, J.: In Memoriam Karen Sparck Jones (2007) 0.02 
    0.016877372 = product of:
  0.050632115 = sum of:
    0.015144923 = weight(_text_:in in 2927) [ClassicSimilarity], result of:
      0.015144923 = score(doc=2927,freq=4.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.25504774 = fieldWeight in 2927, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.09375 = fieldNorm(doc=2927)
    0.035487194 = product of:
      0.07097439 = sum of:
        0.07097439 = weight(_text_:22 in 2927) [ClassicSimilarity], result of:
          0.07097439 = score(doc=2927,freq=2.0), product of:
            0.15286934 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.043654136 = queryNorm
            0.46428138 = fieldWeight in 2927, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.09375 = fieldNorm(doc=2927)
      0.5 = coord(1/2)
  0.33333334 = coord(2/6)
    Abstract
    This note is also appearing in the Journal of the American Society for Information Systems and Technology.
    Date
    26.12.2007 14:22:47
  2. Hawking, D.; Robertson, S.: On collection size and retrieval effectiveness (2003) 0.01 
    0.01115255 = product of:
  0.066915296 = sum of:
    0.066915296 = product of:
      0.13383059 = sum of:
        0.13383059 = weight(_text_:22 in 4109) [ClassicSimilarity], result of:
          0.13383059 = score(doc=4109,freq=4.0), product of:
            0.15286934 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.043654136 = queryNorm
            0.8754574 = fieldWeight in 4109, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.125 = fieldNorm(doc=4109)
      0.5 = coord(1/2)
  0.16666667 = coord(1/6)
    Date
    14. 8.2005 14:22:22
  3. Robertson, S.: On the history of evaluation in IR (2009) 0.00 
    0.0023797948 = product of:
  0.014278769 = sum of:
    0.014278769 = weight(_text_:in in 3653) [ClassicSimilarity], result of:
      0.014278769 = score(doc=3653,freq=8.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.24046129 = fieldWeight in 3653, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.0625 = fieldNorm(doc=3653)
  0.16666667 = coord(1/6)
    Abstract
    This paper is a personal take on the history of evaluation experiments in information retrieval. It describes some of the early experiments that were formative in our understanding, and goes on to discuss the current dominance of TREC (the Text REtrieval Conference) and to assess its impact.
    Source
    Information science in transition, Ed.: A. Gilchrist
  4. Bodoff, D.; Robertson, S.: ¬A new unified probabilistic model (2004) 0.00 
    0.0021859813 = product of:
  0.013115887 = sum of:
    0.013115887 = weight(_text_:in in 2129) [ClassicSimilarity], result of:
      0.013115887 = score(doc=2129,freq=12.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.22087781 = fieldWeight in 2129, product of:
          3.4641016 = tf(freq=12.0), with freq of:
            12.0 = termFreq=12.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.046875 = fieldNorm(doc=2129)
  0.16666667 = coord(1/6)
    Abstract
    This paper proposes a new unified probabilistic model. Two previous models, Robertson et al.'s "Model 0" and "Model 3," each have strengths and weaknesses. The strength of Model 0 not found in Model 3, is that it does not require relevance data about the particular document or query, and, related to that, its probability estimates are straightforward. The strength of Model 3 not found in Model 0 is that it can utilize feedback information about the particular document and query in question. In this paper we introduce a new unified probabilistic model that combines these strengths: the expression of its probabilities is straightforward, it does not require that data must be available for the particular document or query in question, but it can utilize such specific data if it is available. The model is one way to resolve the difficulty of combining two marginal views in probabilistic retrieval.
  5. Robertson, S.; Walker, S.: Threshold setting in adaptive filtering (2000) 0.00 
    0.0020823204 = product of:
  0.012493922 = sum of:
    0.012493922 = weight(_text_:in in 2835) [ClassicSimilarity], result of:
      0.012493922 = score(doc=2835,freq=2.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.21040362 = fieldWeight in 2835, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.109375 = fieldNorm(doc=2835)
  0.16666667 = coord(1/6)
  6. Robertson, S.; Callan, J.: Routing and filtering (2005) 0.00 
    0.0020823204 = product of:
  0.012493922 = sum of:
    0.012493922 = weight(_text_:in in 4688) [ClassicSimilarity], result of:
      0.012493922 = score(doc=4688,freq=2.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.21040362 = fieldWeight in 4688, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.109375 = fieldNorm(doc=4688)
  0.16666667 = coord(1/6)
    Source
    TREC: experiment and evaluation in information retrieval. Ed.: E.M. Voorhees, u. D.K. Harman
  7. Willett, P.; Robertson, S.: In memoriam: Karen Sparck Jones (2007) 0.00 
    0.0020823204 = product of:
  0.012493922 = sum of:
    0.012493922 = weight(_text_:in in 833) [ClassicSimilarity], result of:
      0.012493922 = score(doc=833,freq=2.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.21040362 = fieldWeight in 833, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.109375 = fieldNorm(doc=833)
  0.16666667 = coord(1/6)
  8. Robertson, S.: How Okapi came to TREC (2005) 0.00 
    0.0017848461 = product of:
  0.010709076 = sum of:
    0.010709076 = weight(_text_:in in 5087) [ClassicSimilarity], result of:
      0.010709076 = score(doc=5087,freq=2.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.18034597 = fieldWeight in 5087, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.09375 = fieldNorm(doc=5087)
  0.16666667 = coord(1/6)
    Source
    TREC: experiment and evaluation in information retrieval. Ed.: E.M. Voorhees, u. D.K. Harman
  9. Robertson, S.; Tait, J.: Karen Sparck Jones (2008) 0.00 
    0.0017848461 = product of:
  0.010709076 = sum of:
    0.010709076 = weight(_text_:in in 1596) [ClassicSimilarity], result of:
      0.010709076 = score(doc=1596,freq=2.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.18034597 = fieldWeight in 1596, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.09375 = fieldNorm(doc=1596)
  0.16666667 = coord(1/6)
    Series
    In Memoriam
  10. Robertson, S.: Understanding inverse document frequency : on theoretical arguments for IDF (2004) 0.00 
    0.0014724231 = product of:
  0.008834538 = sum of:
    0.008834538 = weight(_text_:in in 4421) [ClassicSimilarity], result of:
      0.008834538 = score(doc=4421,freq=4.0), product of:
        0.059380736 = queryWeight, product of:
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.043654136 = queryNorm
        0.14877784 = fieldWeight in 4421, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          1.3602545 = idf(docFreq=30841, maxDocs=44218)
          0.0546875 = fieldNorm(doc=4421)
  0.16666667 = coord(1/6)
    Abstract
    The term-weighting function known as IDF was proposed in 1972, and has since been extremely widely used, usually as part of a TF*IDF function. It is often described as a heuristic, and many papers have been written (some based on Shannon's Information Theory) seeking to establish some theoretical basis for it. Some of these attempts are reviewed, and it is shown that the Information Theory approaches are problematic, but that there are good theoretical justifications of both IDF and TF*IDF in the traditional probabilistic model of information retrieval.

Authors

Themes