Search (10 results, page 1 of 1)

  • × language_ss:"e"
  • × theme_ss:"Retrievalstudien"
  • × year_i:[1970 TO 1980}
  1. McGill, M.J.; Huitfeldt, J.: Experimental techniques of information retrieval (1979) 0.04
    0.037281495 = product of:
      0.05592224 = sum of:
        0.027916465 = weight(_text_:of in 279) [ClassicSimilarity], result of:
          0.027916465 = score(doc=279,freq=4.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.34207192 = fieldWeight in 279, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.109375 = fieldNorm(doc=279)
        0.028005775 = product of:
          0.05601155 = sum of:
            0.05601155 = weight(_text_:science in 279) [ClassicSimilarity], result of:
              0.05601155 = score(doc=279,freq=2.0), product of:
                0.13747036 = queryWeight, product of:
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.05218836 = queryNorm
                0.40744454 = fieldWeight in 279, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.109375 = fieldNorm(doc=279)
          0.5 = coord(1/2)
      0.6666667 = coord(2/3)
    
    Source
    Annual review of information science and technology. 14(1979), S.93-128
  2. Rijsbergen, C.J. van: ¬A test for the separation of relevant and non-relevant documents in experimental retrieval collections (1973) 0.04
    0.035670638 = product of:
      0.053505957 = sum of:
        0.025222747 = weight(_text_:of in 5002) [ClassicSimilarity], result of:
          0.025222747 = score(doc=5002,freq=10.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.3090647 = fieldWeight in 5002, product of:
              3.1622777 = tf(freq=10.0), with freq of:
                10.0 = termFreq=10.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.0625 = fieldNorm(doc=5002)
        0.028283209 = product of:
          0.056566417 = sum of:
            0.056566417 = weight(_text_:22 in 5002) [ClassicSimilarity], result of:
              0.056566417 = score(doc=5002,freq=2.0), product of:
                0.18275474 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.05218836 = queryNorm
                0.30952093 = fieldWeight in 5002, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.0625 = fieldNorm(doc=5002)
          0.5 = coord(1/2)
      0.6666667 = coord(2/3)
    
    Abstract
    Many retrievalexperiments are intended to discover ways of improving performance, taking the results obtained with some particular technique as a baseline. The fact that substantial alterations to a system often have little or no effect on particular collections is puzzling. This may be due to the initially poor seperation of relevant and non-relevant documents. The paper presents a procedure for characterizing this seperation for a collection, which can be used to show whether proposed modifications of the base system are likely to be useful.
    Date
    19. 3.1996 11:22:12
    Source
    Journal of documentation. 29(1973) no.3, S.251-257
  3. Cooper, W.S.: ¬On selecting a measure of retrieval effectiveness, revisited (1973) 0.03
    0.031955566 = product of:
      0.047933348 = sum of:
        0.023928396 = weight(_text_:of in 1930) [ClassicSimilarity], result of:
          0.023928396 = score(doc=1930,freq=4.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.2932045 = fieldWeight in 1930, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.09375 = fieldNorm(doc=1930)
        0.02400495 = product of:
          0.0480099 = sum of:
            0.0480099 = weight(_text_:science in 1930) [ClassicSimilarity], result of:
              0.0480099 = score(doc=1930,freq=2.0), product of:
                0.13747036 = queryWeight, product of:
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.05218836 = queryNorm
                0.34923816 = fieldWeight in 1930, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.09375 = fieldNorm(doc=1930)
          0.5 = coord(1/2)
      0.6666667 = coord(2/3)
    
    Source
    Journal of the American Society for Information Science. 24(1973), S.87-100
  4. Bhattacharyya, K.: ¬The effectiveness of natural language in science indexing and retrieval (1974) 0.03
    0.030853499 = product of:
      0.046280246 = sum of:
        0.029306183 = weight(_text_:of in 2628) [ClassicSimilarity], result of:
          0.029306183 = score(doc=2628,freq=24.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.3591007 = fieldWeight in 2628, product of:
              4.8989797 = tf(freq=24.0), with freq of:
                24.0 = termFreq=24.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.046875 = fieldNorm(doc=2628)
        0.016974064 = product of:
          0.033948127 = sum of:
            0.033948127 = weight(_text_:science in 2628) [ClassicSimilarity], result of:
              0.033948127 = score(doc=2628,freq=4.0), product of:
                0.13747036 = queryWeight, product of:
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.05218836 = queryNorm
                0.24694869 = fieldWeight in 2628, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.046875 = fieldNorm(doc=2628)
          0.5 = coord(1/2)
      0.6666667 = coord(2/3)
    
    Abstract
    This paper examines the implications of the findings of evaluative tests regarding the retrieval performance of natural language in various subject fields. It suggests parallel investigations into the structure of natural language, with particular reference to terminology, as used in the different branches of basic science. The criteria for defining the terminological consistency of a subject are formulated and a measure suggested for determining the degree of terminological consistency. The terminological and information structures of specific disciplines such as, chemistry, physics, botany, zoology, and geology; the circumstances in which terms originate; and the efforts made by the international scientific community to standardize the terminology in their respective disciplines - are examined in detail. This investigation shows why and how an artificially created scientific language finds it impossible to keep pace with current developments and thus points to the source of strength of natural language
    Source
    Journal of documentation. 30(1974), S.235-254
  5. Byrne, J.R.: Relative effectiveness of titles, abstracts, and subject headings for machine retrieval from the COMPENDEX services (1975) 0.03
    0.027946234 = product of:
      0.04191935 = sum of:
        0.027916465 = weight(_text_:of in 1604) [ClassicSimilarity], result of:
          0.027916465 = score(doc=1604,freq=16.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.34207192 = fieldWeight in 1604, product of:
              4.0 = tf(freq=16.0), with freq of:
                16.0 = termFreq=16.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.0546875 = fieldNorm(doc=1604)
        0.0140028875 = product of:
          0.028005775 = sum of:
            0.028005775 = weight(_text_:science in 1604) [ClassicSimilarity], result of:
              0.028005775 = score(doc=1604,freq=2.0), product of:
                0.13747036 = queryWeight, product of:
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.05218836 = queryNorm
                0.20372227 = fieldWeight in 1604, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.6341193 = idf(docFreq=8627, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=1604)
          0.5 = coord(1/2)
      0.6666667 = coord(2/3)
    
    Abstract
    We have investigated the relative merits of searching on titles, subject headings, abstracts, free-language terms, and combinations of these elements. The COMPENDEX data base was used for this study since it combined all of these data elements of interest. In general, the results obtained from the experiments indicate that, as expected, titles alone are not satisfactory for efficient retrieval. The combination of titles and abstracts came the closest to 100% retrieval, with searching of abstracts alone doing almost as well. Indexer input, although necessary for 100% retrieval in almost all cases, was found to be relatively unimportant
    Source
    Journal of the American Society for Information Science. 26(1975), S.223-229
  6. Rijsbergen, C.J. van: Foundations of evaluation (1974) 0.01
    0.013293555 = product of:
      0.039880663 = sum of:
        0.039880663 = weight(_text_:of in 1078) [ClassicSimilarity], result of:
          0.039880663 = score(doc=1078,freq=4.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.48867416 = fieldWeight in 1078, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.15625 = fieldNorm(doc=1078)
      0.33333334 = coord(1/3)
    
    Source
    Journal of documentation. 30(1974), S.365-373
  7. Schabas, A.H.: ¬A comparative evaluation of the retrieval effectiveness of titles, Library of Congress Subject Headings and PRECIS strings for computer searching of UK MARC data (1979) 0.01
    0.012611373 = product of:
      0.03783412 = sum of:
        0.03783412 = weight(_text_:of in 5277) [ClassicSimilarity], result of:
          0.03783412 = score(doc=5277,freq=10.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.46359703 = fieldWeight in 5277, product of:
              3.1622777 = tf(freq=10.0), with freq of:
                10.0 = termFreq=10.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.09375 = fieldNorm(doc=5277)
      0.33333334 = coord(1/3)
    
    Imprint
    London : University of London
  8. Cooper, W.S.: ¬The paradoxal role of unexamined documents in the evaluation of retrieval effectiveness (1976) 0.01
    0.010634843 = product of:
      0.03190453 = sum of:
        0.03190453 = weight(_text_:of in 2186) [ClassicSimilarity], result of:
          0.03190453 = score(doc=2186,freq=4.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.39093933 = fieldWeight in 2186, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.125 = fieldNorm(doc=2186)
      0.33333334 = coord(1/3)
    
  9. Sparck Jones, K.; Rijsbergen, C.J. van: Progress in documentation : Information retrieval test collection (1976) 0.01
    0.0073566344 = product of:
      0.022069903 = sum of:
        0.022069903 = weight(_text_:of in 4161) [ClassicSimilarity], result of:
          0.022069903 = score(doc=4161,freq=10.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.2704316 = fieldWeight in 4161, product of:
              3.1622777 = tf(freq=10.0), with freq of:
                10.0 = termFreq=10.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.0546875 = fieldNorm(doc=4161)
      0.33333334 = coord(1/3)
    
    Abstract
    Many retrieval experiments have been based on inadequate test collections, and current research is hampered by the lack of proper collections. This short review does not attempt a fully docuemted survey of all the collections used in the past decade: hopefully representative examples have been studied to throw light on the requriements test collections should meet, to show how past collections have been defective, and to suggest guidelines for a future "ideal" test collection. This specifications for this collection can be taken as an indirect comment on our present state of knowledge of major retrieval system variables, and experience in conducting experiments.
    Source
    Journal of documentation. 32(1976) no.1, S.59-75
  10. King, D.W.; Bryant, E.C.: ¬The evaluation of information services and products (1971) 0.01
    0.0066467775 = product of:
      0.019940332 = sum of:
        0.019940332 = weight(_text_:of in 4157) [ClassicSimilarity], result of:
          0.019940332 = score(doc=4157,freq=4.0), product of:
            0.08160993 = queryWeight, product of:
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.05218836 = queryNorm
            0.24433708 = fieldWeight in 4157, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.5637573 = idf(docFreq=25162, maxDocs=44218)
              0.078125 = fieldNorm(doc=4157)
      0.33333334 = coord(1/3)
    
    Content
    Covers the evaluative and control aspects of: dclassification and indexing processes and languages; document screening processes; composition, reproduction, acquisition, storage, and presentation; usersystem interfaces. Also contains brief and lucid primers on user surveys, statistics, sampling methods, and experimental design.