Search (3 results, page 1 of 1)

  • × theme_ss:"OPAC"
  • × theme_ss:"Retrievalstudien"
  1. Lancaster, F.W.; Connell, T.H.; Bishop, N.; McCowan, S.: Identifying barriers to effective subject access in library catalogs (1991) 0.02
    0.015543535 = product of:
      0.03108707 = sum of:
        0.03108707 = product of:
          0.06217414 = sum of:
            0.06217414 = weight(_text_:cataloging in 2259) [ClassicSimilarity], result of:
              0.06217414 = score(doc=2259,freq=2.0), product of:
                0.20397975 = queryWeight, product of:
                  3.9411201 = idf(docFreq=2334, maxDocs=44218)
                  0.051756795 = queryNorm
                0.30480546 = fieldWeight in 2259, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.9411201 = idf(docFreq=2334, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=2259)
          0.5 = coord(1/2)
      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.
  2. Wien, C.: Sample sizes and composition : their effect on recall and precision in IR experiments with OPACs (2000) 0.02
    0.015543535 = product of:
      0.03108707 = sum of:
        0.03108707 = product of:
          0.06217414 = sum of:
            0.06217414 = weight(_text_:cataloging in 5368) [ClassicSimilarity], result of:
              0.06217414 = score(doc=5368,freq=2.0), product of:
                0.20397975 = queryWeight, product of:
                  3.9411201 = idf(docFreq=2334, maxDocs=44218)
                  0.051756795 = queryNorm
                0.30480546 = fieldWeight in 5368, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.9411201 = idf(docFreq=2334, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=5368)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
    Source
    Cataloging and classification quarterly. 29(2000) no.4, S.73-86
  3. Schultz Jr., W.N.; Braddy, L.: ¬A librarian-centered study of perceptions of subject terms and controlled vocabulary (2017) 0.02
    0.015543535 = product of:
      0.03108707 = sum of:
        0.03108707 = product of:
          0.06217414 = sum of:
            0.06217414 = weight(_text_:cataloging in 5156) [ClassicSimilarity], result of:
              0.06217414 = score(doc=5156,freq=2.0), product of:
                0.20397975 = queryWeight, product of:
                  3.9411201 = idf(docFreq=2334, maxDocs=44218)
                  0.051756795 = queryNorm
                0.30480546 = fieldWeight in 5156, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.9411201 = idf(docFreq=2334, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=5156)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
    Source
    Cataloging and classification quarterly. 55(2017) no.7/8, S.456-466