Search (3 results, page 1 of 1)

0.0010635054 = product of:
  0.0021270108 = sum of:
    0.0021270108 = product of:
      0.0042540217 = sum of:
        0.0042540217 = weight(_text_:s in 4327) [ClassicSimilarity], result of:
          0.0042540217 = score(doc=4327,freq=4.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.08494043 = fieldWeight in 4327, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4327)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Footnote

Wiederabdruck in: Journal of documentation. 61(2005) no.5, S.571-581.

Source

Journal of documentation. 26(1970), S.89-101

0.0010635054 = product of:
  0.0021270108 = sum of:
    0.0021270108 = product of:
      0.0042540217 = sum of:
        0.0042540217 = weight(_text_:s in 4392) [ClassicSimilarity], result of:
          0.0042540217 = score(doc=4392,freq=4.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.08494043 = fieldWeight in 4392, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4392)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

Purpose - This paper was originally published in 1970 (Journal of documentation. 26(1970), S.89-101), considered the suggestion that classifications for retrieval should be constructed automatically and raised some serious problems concerning the sorts of classification which were required, and the way in which formal classification theories should be exploited, given that a retrieval classification is required for a purpose. These difficulties had not been sufficiently considered, and the paper, therefore, aims to attempt an analysis of them, though no solutions of immediate application could be suggested. Design/methodology/approach - Starting with the illustrative proposition that a polythetic, multiple, unordered classification is required in automatic thesaurus construction, this is considered in the context of classification in general, where eight sorts of classification can be distinguished, each covering a range of class definitions and class-finding algorithms. Findings - Since there is generally no natural or best classification of a set of objects as such, the evaluation of alternative classifications requires either formal criteria of goodness of fit, or, if a classification is required for a purpose, a precise statement of that purpose. In any case a substantive theory of classification is needed, which does not exist; and, since sufficiently precise specifications of retrieval requirements are also lacking, the only currently available approach to automatic classification experiments for information retrieval is to do enough of them. Originality/value - Gives insights into the classification of material for information retrieval.

Source

Journal of documentation. 61(2005) no.5, S.571-581

0.0010528166 = product of:
  0.0021056333 = sum of:
    0.0021056333 = product of:
      0.0042112665 = sum of:
        0.0042112665 = weight(_text_:s in 4328) [ClassicSimilarity], result of:
          0.0042112665 = score(doc=4328,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.08408674 = fieldWeight in 4328, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0546875 = fieldNorm(doc=4328)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Source

Journal of documentation. 61(2005) no.5, S.598-601