Search (5 results, page 1 of 1)

0.030816004 = product of:
  0.061632007 = sum of:
    0.061632007 = product of:
      0.123264015 = sum of:
        0.123264015 = weight(_text_:journals in 3874) [ClassicSimilarity], result of:
          0.123264015 = score(doc=3874,freq=6.0), product of:
            0.25656942 = queryWeight, product of:
              5.021064 = idf(docFreq=792, maxDocs=44218)
              0.05109862 = queryNorm
            0.48043144 = fieldWeight in 3874, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              5.021064 = idf(docFreq=792, maxDocs=44218)
              0.0390625 = fieldNorm(doc=3874)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

In the study of growth dynamics of artificial and natural systems, the scaling properties of fluctuations can exhibit information an the underlying processes responsible for the observed macroscopic behavior according to H.E. Stanley and colleagues (Lee, Amaral, Canning, Meyer, & Stanley, 1998; Plerou, Amaral, Gopikrishnan, Meyer, & Stanley, 1999; Stanley et al., 1996). With such an approach, they examined the growth dynamics of firms, of national economies, and of university research fundings and paper output. We investigated the scaling properties of journal output and impact according to the Journal Citation Reports (JCR; ISI, Philadelphia, PA) and find distributions of paper output and of citations near to lognormality. Growth rate distributions are near to Laplace "tents," however with a better fit to Subbotin distributions. The width of fluctuations decays with size according to a power law. The form of growth rate distributions seems not to depend an journal size, and conditional probability densities of the growth rates can thus be scaled onto one graph. To some extent even quantitatively, all our results are in agreement with the observations of Stanley and others. Further on, a Matthew effect of journal citations is confirmed. If journals "behave" like business firms, a better understanding of Bradford's Law as a result of competition among publishing houses, journals, and topics suggests itself.

0.028466603 = product of:
  0.056933206 = sum of:
    0.056933206 = product of:
      0.11386641 = sum of:
        0.11386641 = weight(_text_:journals in 1686) [ClassicSimilarity], result of:
          0.11386641 = score(doc=1686,freq=2.0), product of:
            0.25656942 = queryWeight, product of:
              5.021064 = idf(docFreq=792, maxDocs=44218)
              0.05109862 = queryNorm
            0.44380352 = fieldWeight in 1686, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              5.021064 = idf(docFreq=792, maxDocs=44218)
              0.0625 = fieldNorm(doc=1686)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Abstract

The fields of informetrics and scientometrics have suffered from the lack of a powerful test to detect the differences between two samples. We show that the Mann-Whitney test is a good test an the publication productivity of journals and of authors. Its main limitation is a lack of Power on small samples that have small differences. This is not the fault of the test, but rather reflects the fact that small, similar samples have little to distinguish between them.

0.020769471 = product of:
  0.041538943 = sum of:
    0.041538943 = product of:
      0.083077885 = sum of:
        0.083077885 = weight(_text_:22 in 360) [ClassicSimilarity], result of:
          0.083077885 = score(doc=360,freq=2.0), product of:
            0.17893866 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.05109862 = queryNorm
            0.46428138 = fieldWeight in 360, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.09375 = fieldNorm(doc=360)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Source

Technik und Information: Markt, Medien und Methoden. Deutscher Dokumentartag 1992, Technische Universität Berlin, 22.-25.9.1992. Hrsg.: W. Neubauer u. K.-H. Meier

0.012115525 = product of:
  0.02423105 = sum of:
    0.02423105 = product of:
      0.0484621 = sum of:
        0.0484621 = weight(_text_:22 in 29) [ClassicSimilarity], result of:
          0.0484621 = score(doc=29,freq=2.0), product of:
            0.17893866 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.05109862 = queryNorm
            0.2708308 = fieldWeight in 29, 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=29)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

27.10.2006 14:22:06

0.0043269736 = product of:
  0.008653947 = sum of:
    0.008653947 = product of:
      0.017307894 = sum of:
        0.017307894 = weight(_text_:22 in 4880) [ClassicSimilarity], result of:
          0.017307894 = score(doc=4880,freq=2.0), product of:
            0.17893866 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.05109862 = queryNorm
            0.09672529 = fieldWeight in 4880, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.01953125 = fieldNorm(doc=4880)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Date

22. 1.2006 19:45:49