Search (5 results, page 1 of 1)

  • × theme_ss:"OPAC"
  • × theme_ss:"Retrievalstudien"
  • × year_i:[1990 TO 2000}
  1. Hofstede, M.: Literatuur over onderwerpen zoeken in de OPC (1994) 0.01
    0.014418405 = product of:
      0.02883681 = sum of:
        0.02883681 = product of:
          0.05767362 = sum of:
            0.05767362 = weight(_text_:m in 5400) [ClassicSimilarity], result of:
              0.05767362 = score(doc=5400,freq=2.0), product of:
                0.13110629 = queryWeight, product of:
                  2.4884486 = idf(docFreq=9980, maxDocs=44218)
                  0.052685954 = queryNorm
                0.4398997 = fieldWeight in 5400, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.4884486 = idf(docFreq=9980, maxDocs=44218)
                  0.125 = fieldNorm(doc=5400)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
  2. Hancock-Beaulieu, M.; McKenzie, L.; Irving, A.: Evaluative protocols for searching behaviour in online library catalogues (1991) 0.01
    0.012616104 = product of:
      0.025232209 = sum of:
        0.025232209 = product of:
          0.050464418 = sum of:
            0.050464418 = weight(_text_:m in 347) [ClassicSimilarity], result of:
              0.050464418 = score(doc=347,freq=2.0), product of:
                0.13110629 = queryWeight, product of:
                  2.4884486 = idf(docFreq=9980, maxDocs=44218)
                  0.052685954 = queryNorm
                0.38491225 = fieldWeight in 347, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.4884486 = idf(docFreq=9980, maxDocs=44218)
                  0.109375 = fieldNorm(doc=347)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
  3. Lancaster, F.W.; Connell, T.H.; Bishop, N.; McCowan, S.: Identifying barriers to effective subject access in library catalogs (1991) 0.01
    0.010585507 = product of:
      0.021171015 = sum of:
        0.021171015 = product of:
          0.08468406 = sum of:
            0.08468406 = weight(_text_:authors in 2259) [ClassicSimilarity], result of:
              0.08468406 = score(doc=2259,freq=2.0), product of:
                0.24018547 = queryWeight, product of:
                  4.558814 = idf(docFreq=1258, maxDocs=44218)
                  0.052685954 = queryNorm
                0.35257778 = fieldWeight in 2259, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  4.558814 = idf(docFreq=1258, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=2259)
          0.25 = coord(1/4)
      0.5 = coord(1/2)
    
    Abstract
    51 subject searches were performed in an online catalog containing about 4,5 million records. Their success was judges in terms of lists of items, known to be relevant to the various topics, compiled by subject specialists (faculty members or authors of articles in specialized encyclopedias). Many of the items known to be relevant were not retrieved, even in very broad searches that sometimes retrieved several hundred records, and very little could be done to make them retrievable within the constraints of present cataloging practice. Librarians should recognize that library catalogs, as now implemented, offer only the most primitive of subject access and should seek to develop different types of subject access tools. - Vgl auch Letter (B.H. Weinberg) in: LTRS 36(1992) S.123-124.
  4. Kilgour, F.G.; Moran, B.B.; Barden, J.R.: Retrieval effectiveness of surname-title-word searches for known items by academic library users (1999) 0.01
    0.010585507 = product of:
      0.021171015 = sum of:
        0.021171015 = product of:
          0.08468406 = sum of:
            0.08468406 = weight(_text_:authors in 3061) [ClassicSimilarity], result of:
              0.08468406 = score(doc=3061,freq=2.0), product of:
                0.24018547 = queryWeight, product of:
                  4.558814 = idf(docFreq=1258, maxDocs=44218)
                  0.052685954 = queryNorm
                0.35257778 = fieldWeight in 3061, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  4.558814 = idf(docFreq=1258, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=3061)
          0.25 = coord(1/4)
      0.5 = coord(1/2)
    
    Abstract
    This article reports the findings of an experiment using a simulated title pages, author surnames, and title words, one-third of which were selected by each of the 3 authors, to determine the frequency of one-screen displays when used to search for known items in an implied Boolean retrieval system. Searches comprising surname plus one significant title word produced one-screen displays 78% of time; surname plus 2 words 97% of the time; and surname plus 3 words 98,5%. Three quarters of the significant words were nouns
  5. Peters, T.A.; Kurth, M.: Controlled and uncontrolled vocabulary subject searching in an academic library online catalog (1991) 0.01
    0.006308052 = product of:
      0.012616104 = sum of:
        0.012616104 = product of:
          0.025232209 = sum of:
            0.025232209 = weight(_text_:m in 2348) [ClassicSimilarity], result of:
              0.025232209 = score(doc=2348,freq=2.0), product of:
                0.13110629 = queryWeight, product of:
                  2.4884486 = idf(docFreq=9980, maxDocs=44218)
                  0.052685954 = queryNorm
                0.19245613 = fieldWeight in 2348, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.4884486 = idf(docFreq=9980, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=2348)
          0.5 = coord(1/2)
      0.5 = coord(1/2)