Search (7 results, page 1 of 1)

  • × year_i:[1970 TO 1980}
  • × author_ss:"Robertson, S.E."
  1. Robertson, S.E.: Indexing theory and retrieval effectiveness (1979) 0.00 
    0.0033826875 = product of:
  0.006765375 = sum of:
    0.006765375 = product of:
      0.01353075 = sum of:
        0.01353075 = weight(_text_:a in 5175) [ClassicSimilarity], result of:
          0.01353075 = score(doc=5175,freq=2.0), product of:
            0.053105544 = queryWeight, product of:
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.046056706 = queryNorm
            0.25478977 = fieldWeight in 5175, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.15625 = fieldNorm(doc=5175)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Type
    a
  2. Robertson, S.E.; Belkin, N.J.: Ranking in principle (1978) 0.00 
    0.00270615 = product of:
  0.0054123 = sum of:
    0.0054123 = product of:
      0.0108246 = sum of:
        0.0108246 = weight(_text_:a in 1143) [ClassicSimilarity], result of:
          0.0108246 = score(doc=1143,freq=2.0), product of:
            0.053105544 = queryWeight, product of:
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.046056706 = queryNorm
            0.20383182 = fieldWeight in 1143, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.125 = fieldNorm(doc=1143)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Type
    a
  3. Robertson, S.E.: ¬The probabilistic character of relevance (1977) 0.00 
    0.00270615 = product of:
  0.0054123 = sum of:
    0.0054123 = product of:
      0.0108246 = sum of:
        0.0108246 = weight(_text_:a in 7399) [ClassicSimilarity], result of:
          0.0108246 = score(doc=7399,freq=2.0), product of:
            0.053105544 = queryWeight, product of:
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.046056706 = queryNorm
            0.20383182 = fieldWeight in 7399, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.125 = fieldNorm(doc=7399)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Type
    a
  4. Robertson, S.E.; Sparck Jones, K.: Relevance weighting of search terms (1976) 0.00 
    0.00270615 = product of:
  0.0054123 = sum of:
    0.0054123 = product of:
      0.0108246 = sum of:
        0.0108246 = weight(_text_:a in 71) [ClassicSimilarity], result of:
          0.0108246 = score(doc=71,freq=8.0), product of:
            0.053105544 = queryWeight, product of:
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.046056706 = queryNorm
            0.20383182 = fieldWeight in 71, product of:
              2.828427 = tf(freq=8.0), with freq of:
                8.0 = termFreq=8.0
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.0625 = fieldNorm(doc=71)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Abstract
    Examines statistical techniques for exploiting relevance information to weight search terms. These techniques are presented as a natural extension of weighting methods using information about the distribution of index terms in documents in general. A series of relevance weighting functions is derived and is justified by theoretical considerations. In particular, it is shown that specific weighted search methods are implied by a general probabilistic theory of retrieval. Different applications of relevance weighting are illustrated by experimental results for test collections
    Type
    a
  5. Robertson, S.E.: ¬The probability ranking principle in IR (1977) 0.00 
    0.0020296127 = product of:
  0.0040592253 = sum of:
    0.0040592253 = product of:
      0.008118451 = sum of:
        0.008118451 = weight(_text_:a in 1935) [ClassicSimilarity], result of:
          0.008118451 = score(doc=1935,freq=2.0), product of:
            0.053105544 = queryWeight, product of:
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.046056706 = queryNorm
            0.15287387 = fieldWeight in 1935, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.09375 = fieldNorm(doc=1935)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Type
    a
  6. Robertson, S.E.: Theories and models in information retrieval (1977) 0.00 
    0.001913537 = product of:
  0.003827074 = sum of:
    0.003827074 = product of:
      0.007654148 = sum of:
        0.007654148 = weight(_text_:a in 1844) [ClassicSimilarity], result of:
          0.007654148 = score(doc=1844,freq=4.0), product of:
            0.053105544 = queryWeight, product of:
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.046056706 = queryNorm
            0.14413087 = fieldWeight in 1844, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.0625 = fieldNorm(doc=1844)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Abstract
    This paper is concerned with recent work in the theory of information retrieval. More particularly, it is concerned with theories which tackle the problem of retrieval performance, in a sense which will be explained. The aim is not an exhaustive survey of such work; rather it is an analysis and synthesis of those contributions which I feel to be important or find interesting
    Type
    a
  7. Robertson, S.E.; Walker, S.: Some simple effective approximations to the 2-Poisson molde for probabilisitc weighted retrieval (1979) 0.00 
    0.0016913437 = product of:
  0.0033826875 = sum of:
    0.0033826875 = product of:
      0.006765375 = sum of:
        0.006765375 = weight(_text_:a in 1940) [ClassicSimilarity], result of:
          0.006765375 = score(doc=1940,freq=2.0), product of:
            0.053105544 = queryWeight, product of:
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.046056706 = queryNorm
            0.12739488 = fieldWeight in 1940, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.153047 = idf(docFreq=37942, maxDocs=44218)
              0.078125 = fieldNorm(doc=1940)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Type
    a

Authors

Themes