Search (3 results, page 1 of 1)

  • × author_ss:"Burrell, Q.L."
  • × year_i:[2000 TO 2010}
  1. Burrell, Q.L.: Extending Lotkaian informetrics (2008) 0.02
    0.024581954 = product of:
      0.049163908 = sum of:
        0.049163908 = product of:
          0.098327816 = sum of:
            0.098327816 = weight(_text_:ii in 2126) [ClassicSimilarity], result of:
              0.098327816 = score(doc=2126,freq=2.0), product of:
                0.2745971 = queryWeight, product of:
                  5.4016213 = idf(docFreq=541, maxDocs=44218)
                  0.050836053 = queryNorm
                0.3580803 = fieldWeight in 2126, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.4016213 = idf(docFreq=541, maxDocs=44218)
                  0.046875 = fieldNorm(doc=2126)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
    Abstract
    The continuous version of the Lotka distribution, more generally referred to outside of informetrics as the Pareto distribution, has long enjoyed a central position in the theoretical development of informetrics despite several reported drawbacks in modelling empirical data distributions, most particularly that the inverse power form seems mainly to be evident only in the upper tails. We give a number of published examples graphically illustrating this shortcoming. In seeking to overcome this, we here draw attention to an intuitively reasonable generalization of the Pareto distribution, namely the Pareto type II distribution, of which we consider two versions. We describe its basic properties and some statistical features together with concentration aspects and argue that, at least in qualitative terms, it is better able to describe many observed informetric phenomena over the full range of the distribution. Suggestions for further investigations, including truncated and time-dependent versions, are also given.
  2. Burrell, Q.L.: Predicting future citation behavior (2003) 0.01
    0.012053271 = product of:
      0.024106542 = sum of:
        0.024106542 = product of:
          0.048213083 = sum of:
            0.048213083 = weight(_text_:22 in 3837) [ClassicSimilarity], result of:
              0.048213083 = score(doc=3837,freq=2.0), product of:
                0.1780192 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.050836053 = queryNorm
                0.2708308 = fieldWeight in 3837, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=3837)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
    Date
    29. 3.2003 19:22:48
  3. Mingers, J.; Burrell, Q.L.: Modeling citation behavior in Management Science journals (2006) 0.01
    0.010331375 = product of:
      0.02066275 = sum of:
        0.02066275 = product of:
          0.0413255 = sum of:
            0.0413255 = weight(_text_:22 in 994) [ClassicSimilarity], result of:
              0.0413255 = score(doc=994,freq=2.0), product of:
                0.1780192 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.050836053 = queryNorm
                0.23214069 = fieldWeight in 994, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.046875 = fieldNorm(doc=994)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
    Date
    26.12.2007 19:22:05