Search (2 results, page 1 of 1)

  • × theme_ss:"Preserved Context Index System (PRECIS)"
  • × theme_ss:"Verbale Doksprachen im Online-Retrieval"
  1. DeHart, F.E.; Glazier, J.: Computer searching on PRECIS : an exploration of measuring comparative retrieval effectiveness (1984) 0.00 
    0.003939954 = product of:
  0.030206313 = sum of:
    0.014564968 = weight(_text_:im in 828) [ClassicSimilarity], result of:
      0.014564968 = score(doc=828,freq=2.0), product of:
        0.066621356 = queryWeight, product of:
          2.8267863 = idf(docFreq=7115, maxDocs=44218)
          0.023567878 = queryNorm
        0.2186231 = fieldWeight in 828, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.8267863 = idf(docFreq=7115, maxDocs=44218)
          0.0546875 = fieldNorm(doc=828)
    0.005499561 = product of:
      0.010999122 = sum of:
        0.010999122 = weight(_text_:1 in 828) [ClassicSimilarity], result of:
          0.010999122 = score(doc=828,freq=2.0), product of:
            0.057894554 = queryWeight, product of:
              2.4565027 = idf(docFreq=10304, maxDocs=44218)
              0.023567878 = 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)
    0.010141784 = product of:
      0.020283569 = sum of:
        0.020283569 = weight(_text_:international in 828) [ClassicSimilarity], result of:
          0.020283569 = score(doc=828,freq=2.0), product of:
            0.078619614 = queryWeight, product of:
              3.33588 = idf(docFreq=4276, maxDocs=44218)
              0.023567878 = queryNorm
            0.2579963 = fieldWeight in 828, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.33588 = idf(docFreq=4276, maxDocs=44218)
              0.0546875 = fieldNorm(doc=828)
      0.5 = coord(1/2)
  0.13043478 = coord(3/23)
    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 .
    Source
    International classification. 11(1984), S.3-8
    Theme
    Verbale Doksprachen im Online-Retrieval
  2. Dykstra, M.: PRECIS in the online catalog (1989) 0.00 
    0.0029909855 = product of:
  0.03439633 = sum of:
    0.024968514 = weight(_text_:im in 454) [ClassicSimilarity], result of:
      0.024968514 = score(doc=454,freq=2.0), product of:
        0.066621356 = queryWeight, product of:
          2.8267863 = idf(docFreq=7115, maxDocs=44218)
          0.023567878 = queryNorm
        0.37478244 = fieldWeight in 454, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.8267863 = idf(docFreq=7115, maxDocs=44218)
          0.09375 = fieldNorm(doc=454)
    0.0094278185 = product of:
      0.018855637 = sum of:
        0.018855637 = weight(_text_:1 in 454) [ClassicSimilarity], result of:
          0.018855637 = score(doc=454,freq=2.0), product of:
            0.057894554 = queryWeight, product of:
              2.4565027 = idf(docFreq=10304, maxDocs=44218)
              0.023567878 = 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)
  0.08695652 = coord(2/23)
    Source
    Cataloging and classification quarterly. 10(1989) nos.1/2, S.81-94
    Theme
    Verbale Doksprachen im Online-Retrieval

Authors