Search (2 results, page 1 of 1)

  • × theme_ss:"Verbale Doksprachen im Online-Retrieval"
  • × theme_ss:"Preserved Context Index System (PRECIS)"
  1. Dykstra, M.: PRECIS in the online catalog (1989) 0.00 
    2.931158E-4 = product of:
  0.008500358 = sum of:
    0.008500358 = product of:
      0.017000716 = sum of:
        0.017000716 = weight(_text_:1 in 454) [ClassicSimilarity], result of:
          0.017000716 = score(doc=454,freq=2.0), product of:
            0.05219918 = queryWeight, product of:
              2.4565027 = idf(docFreq=10304, maxDocs=44218)
              0.02124939 = queryNorm
            0.32568932 = fieldWeight in 454, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.4565027 = idf(docFreq=10304, maxDocs=44218)
              0.09375 = fieldNorm(doc=454)
      0.5 = coord(1/2)
  0.03448276 = coord(1/29)
    Source
    Cataloging and classification quarterly. 10(1989) nos.1/2, S.81-94
  2. DeHart, F.E.; Glazier, J.: Computer searching on PRECIS : an exploration of measuring comparative retrieval effectiveness (1984) 0.00 
    1.7098419E-4 = product of:
  0.0049585416 = sum of:
    0.0049585416 = product of:
      0.009917083 = sum of:
        0.009917083 = weight(_text_:1 in 828) [ClassicSimilarity], result of:
          0.009917083 = score(doc=828,freq=2.0), product of:
            0.05219918 = queryWeight, product of:
              2.4565027 = idf(docFreq=10304, maxDocs=44218)
              0.02124939 = queryNorm
            0.18998542 = fieldWeight in 828, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.4565027 = idf(docFreq=10304, maxDocs=44218)
              0.0546875 = fieldNorm(doc=828)
      0.5 = coord(1/2)
  0.03448276 = coord(1/29)
    Abstract
    Designing research on the retrieval effectiveness of computer searches on PRECIS compared with retrieval effectiveness of searches on other types of subject analysis used in computer-based information sources is a complex process. This paper explores the complexity of measuring comparative retrieval effectiveness through a comparison of the subject analysis provided by the PRECIS system for fifty articles with the subject analysis provided for the same articles by three computer-based information sources: ERIC/CIJE, LLBA/Online and PsycINFO. Objectives are: (1) to discover factors that should be taken into account when designing this type of research; and (2) to identify extraneous variables that work against internal validity in research design .

Authors