Search (1 results, page 1 of 1)

  • × language_ss:"e"
  • × theme_ss:"Retrievalsprachen"
  • × theme_ss:"Retrievalstudien"
  1. Barker, A.L.: Non-Boolean searching on commercial online systems : optimising use of Dialog TARGET and ESA/IRS QUESTQUORUM (1995) 0.01
    0.0056984248 = product of:
      0.017095273 = sum of:
        0.017095273 = weight(_text_:of in 3853) [ClassicSimilarity], result of:
          0.017095273 = score(doc=3853,freq=6.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.20947541 = fieldWeight in 3853, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.0546875 = fieldNorm(doc=3853)
      0.33333334 = coord(1/3)
    
    Abstract
    Considers 2 non-Boolean searching systems available on commercial online systems. QUESTQUORUM, based on coordination level searching, was introduced by ESA/IRS in Dec. 85. TARGET, which employs partial match probabilistic retrieval was introduced by DIALOG in Dec 93. 6 subject searches were carried out on databases available on both Dialog and ESA/IRS to compare TARGET and QUESTQUORUM with Boolean searching. Outlines the main advantages of these tools, and their disadvantages. Suggests when their use may be preferable
    Source
    Online information 95: Proceedings of the 19th International online information meeting, London, 5-7 December 1995. Ed.: D.I. Raitt u. B. Jeapes