Search (119 results, page 1 of 6)

  • × theme_ss:"Informetrie"
  1. Raan, A.F.J. van: Statistical properties of bibliometric indicators : research group indicator distributions and correlations (2006) 0.11 
    0.10879844 = product of:
  0.27199608 = sum of:
    0.21623175 = weight(_text_:theorem in 5275) [ClassicSimilarity], result of:
      0.21623175 = score(doc=5275,freq=2.0), product of:
        0.39776745 = queryWeight, product of:
          8.200379 = idf(docFreq=32, maxDocs=44218)
          0.04850598 = queryNorm
        0.5436135 = fieldWeight in 5275, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          8.200379 = idf(docFreq=32, maxDocs=44218)
          0.046875 = fieldNorm(doc=5275)
    0.055764344 = weight(_text_:22 in 5275) [ClassicSimilarity], result of:
      0.055764344 = score(doc=5275,freq=4.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.32829654 = fieldWeight in 5275, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.046875 = fieldNorm(doc=5275)
  0.4 = coord(2/5)
    Abstract
    In this article we present an empirical approach to the study of the statistical properties of bibliometric indicators on a very relevant but not simply available aggregation level: the research group. We focus on the distribution functions of a coherent set of indicators that are used frequently in the analysis of research performance. In this sense, the coherent set of indicators acts as a measuring instrument. Better insight into the statistical properties of a measuring instrument is necessary to enable assessment of the instrument itself. The most basic distribution in bibliometric analysis is the distribution of citations over publications, and this distribution is very skewed. Nevertheless, we clearly observe the working of the central limit theorem and find that at the level of research groups the distribution functions of the main indicators, particularly the journal- normalized and the field-normalized indicators, approach normal distributions. The results of our study underline the importance of the idea of group oeuvre, that is, the role of sets of related publications as a unit of analysis.
    Date
    22. 7.2006 16:20:22
  2. Egghe, L.: ¬A new short proof of Naranan's theorem, explaining Lotka's law and Zipf's law (2010) 0.09 
    0.08738903 = product of:
  0.43694514 = sum of:
    0.43694514 = weight(_text_:theorem in 3432) [ClassicSimilarity], result of:
      0.43694514 = score(doc=3432,freq=6.0), product of:
        0.39776745 = queryWeight, product of:
          8.200379 = idf(docFreq=32, maxDocs=44218)
          0.04850598 = queryNorm
        1.0984939 = fieldWeight in 3432, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          8.200379 = idf(docFreq=32, maxDocs=44218)
          0.0546875 = fieldNorm(doc=3432)
  0.2 = coord(1/5)
    Abstract
    Naranan's important theorem, published in Nature in 1970, states that if the number of journals grows exponentially and if the number of articles in each journal grows exponentially (at the same rate for each journal), then the system satisfies Lotka's law and a formula for the Lotka's exponent is given in function of the growth rates of the journals and the articles. This brief communication re-proves this result by showing that the system satisfies Zipf's law, which is equivalent with Lotka's law. The proof is short and algebraic and does not use infinitesimal arguments.
    Object
    Naranan-Theorem
  3. Egghe, L.: ¬A noninformetric analysis of the relationship between citation age and journal productivity (2001) 0.04 
    0.04324635 = product of:
  0.21623175 = sum of:
    0.21623175 = weight(_text_:theorem in 5685) [ClassicSimilarity], result of:
      0.21623175 = score(doc=5685,freq=2.0), product of:
        0.39776745 = queryWeight, product of:
          8.200379 = idf(docFreq=32, maxDocs=44218)
          0.04850598 = queryNorm
        0.5436135 = fieldWeight in 5685, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          8.200379 = idf(docFreq=32, maxDocs=44218)
          0.046875 = fieldNorm(doc=5685)
  0.2 = coord(1/5)
    Abstract
    A problem, raised by Wallace (JASIS, 37,136-145,1986), on the relation between the journal's median citation age and its number of articles is studied. Leaving open the problem as such, we give a statistical explanation of this relationship, when replacing "median" by "mean" in Wallace's problem. The cloud of points, found by Wallace, is explained in this sense that the points are scattered over the area in first quadrant, limited by a curve of the form y=1 + E/x**2 where E is a constant. This curve is obtained by using the Central Limit Theorem in statistics and, hence, has no intrinsic informetric foundation. The article closes with some reflections on explanations of regularities in informetrics, based on statistical, probabilistic or informetric results, or on a combination thereof
  4. Nicholls, P.T.: Empirical validation of Lotka's law (1986) 0.02 
    0.021030052 = product of:
  0.10515025 = sum of:
    0.10515025 = weight(_text_:22 in 5509) [ClassicSimilarity], result of:
      0.10515025 = score(doc=5509,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.61904186 = fieldWeight in 5509, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.125 = fieldNorm(doc=5509)
  0.2 = coord(1/5)
    Source
    Information processing and management. 22(1986), S.417-419
  5. Nicolaisen, J.: Citation analysis (2007) 0.02 
    0.021030052 = product of:
  0.10515025 = sum of:
    0.10515025 = weight(_text_:22 in 6091) [ClassicSimilarity], result of:
      0.10515025 = score(doc=6091,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.61904186 = fieldWeight in 6091, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.125 = fieldNorm(doc=6091)
  0.2 = coord(1/5)
    Date
    13. 7.2008 19:53:22
  6. Fiala, J.: Information flood : fiction and reality (1987) 0.02 
    0.021030052 = product of:
  0.10515025 = sum of:
    0.10515025 = weight(_text_:22 in 1080) [ClassicSimilarity], result of:
      0.10515025 = score(doc=1080,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.61904186 = fieldWeight in 1080, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.125 = fieldNorm(doc=1080)
  0.2 = coord(1/5)
    Source
    Thermochimica acta. 110(1987), S.11-22
  7. Su, Y.; Han, L.-F.: ¬A new literature growth model : variable exponential growth law of literature (1998) 0.02 
    0.018588115 = product of:
  0.09294057 = sum of:
    0.09294057 = weight(_text_:22 in 3690) [ClassicSimilarity], result of:
      0.09294057 = score(doc=3690,freq=4.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.54716086 = fieldWeight in 3690, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.078125 = fieldNorm(doc=3690)
  0.2 = coord(1/5)
    Date
    22. 5.1999 19:22:35
  8. Van der Veer Martens, B.: Do citation systems represent theories of truth? (2001) 0.02 
    0.018588115 = product of:
  0.09294057 = sum of:
    0.09294057 = weight(_text_:22 in 3925) [ClassicSimilarity], result of:
      0.09294057 = score(doc=3925,freq=4.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.54716086 = fieldWeight in 3925, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.078125 = fieldNorm(doc=3925)
  0.2 = coord(1/5)
    Date
    22. 7.2006 15:22:28
  9. Diodato, V.: Dictionary of bibliometrics (1994) 0.02 
    0.018401293 = product of:
  0.09200647 = sum of:
    0.09200647 = weight(_text_:22 in 5666) [ClassicSimilarity], result of:
      0.09200647 = score(doc=5666,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.5416616 = fieldWeight in 5666, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.109375 = fieldNorm(doc=5666)
  0.2 = coord(1/5)
    Footnote
    Rez. in: Journal of library and information science 22(1996) no.2, S.116-117 (L.C. Smith)
  10. Bookstein, A.: Informetric distributions : I. Unified overview (1990) 0.02 
    0.018401293 = product of:
  0.09200647 = sum of:
    0.09200647 = weight(_text_:22 in 6902) [ClassicSimilarity], result of:
      0.09200647 = score(doc=6902,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.5416616 = fieldWeight in 6902, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.109375 = fieldNorm(doc=6902)
  0.2 = coord(1/5)
    Date
    22. 7.2006 18:55:29
  11. Bookstein, A.: Informetric distributions : II. Resilience to ambiguity (1990) 0.02 
    0.018401293 = product of:
  0.09200647 = sum of:
    0.09200647 = weight(_text_:22 in 4689) [ClassicSimilarity], result of:
      0.09200647 = score(doc=4689,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.5416616 = fieldWeight in 4689, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.109375 = fieldNorm(doc=4689)
  0.2 = coord(1/5)
    Date
    22. 7.2006 18:55:55
  12. Lewison, G.: ¬The work of the Bibliometrics Research Group (City University) and associates (2005) 0.02 
    0.015772536 = product of:
  0.07886268 = sum of:
    0.07886268 = weight(_text_:22 in 4890) [ClassicSimilarity], result of:
      0.07886268 = score(doc=4890,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.46428138 = fieldWeight in 4890, 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=4890)
  0.2 = coord(1/5)
    Date
    20. 1.2007 17:02:22
  13. Marx, W.; Bornmann, L.: On the problems of dealing with bibliometric data (2014) 0.02 
    0.015772536 = product of:
  0.07886268 = sum of:
    0.07886268 = weight(_text_:22 in 1239) [ClassicSimilarity], result of:
      0.07886268 = score(doc=1239,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.46428138 = fieldWeight in 1239, 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=1239)
  0.2 = coord(1/5)
    Date
    18. 3.2014 19:13:22
  14. Larivière, V.; Gingras, Y.; Archambault, E.: ¬The decline in the concentration of citations, 1900-2007 (2009) 0.01 
    0.011152869 = product of:
  0.055764344 = sum of:
    0.055764344 = weight(_text_:22 in 2763) [ClassicSimilarity], result of:
      0.055764344 = score(doc=2763,freq=4.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.32829654 = fieldWeight in 2763, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.046875 = fieldNorm(doc=2763)
  0.2 = coord(1/5)
    Date
    22. 3.2009 19:22:35
  15. Li, T.-C.: Reference sources in periodicals : research note (1995) 0.01 
    0.010515026 = product of:
  0.052575126 = sum of:
    0.052575126 = weight(_text_:22 in 5092) [ClassicSimilarity], result of:
      0.052575126 = score(doc=5092,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.30952093 = fieldWeight in 5092, 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=5092)
  0.2 = coord(1/5)
    Abstract
    Presents a list of 53 periodicals in 22 subject fields which regularly provide bibliographies of theses, research in progress and patents in their particular subject field. The fields of business, economics, history and literature have most periodical listings of dissertations and theses. Also lists 63 periodicals in 25 sub-disciplines which provide rankings or ratings. Rankings and ratings information predominates in the fields of business, sports and games, finance and banking, and library and information science
  16. Pichappan, P.; Sangaranachiyar, S.: Ageing approach to scientific eponyms (1996) 0.01 
    0.010515026 = product of:
  0.052575126 = sum of:
    0.052575126 = weight(_text_:22 in 80) [ClassicSimilarity], result of:
      0.052575126 = score(doc=80,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.30952093 = fieldWeight in 80, 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=80)
  0.2 = coord(1/5)
    Footnote
    Report presented at the 16th National Indian Association of Special Libraries and Information Centres Seminar Special Interest Group Meeting on Informatrics in Bombay, 19-22 Dec 94
  17. Mommoh, O.M.: Subject analysis of post-graduate theses in library, archival and information science at Ahmadu Bello University, Zaria (1995/96) 0.01 
    0.010515026 = product of:
  0.052575126 = sum of:
    0.052575126 = weight(_text_:22 in 673) [ClassicSimilarity], result of:
      0.052575126 = score(doc=673,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.30952093 = fieldWeight in 673, 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=673)
  0.2 = coord(1/5)
    Source
    Library focus. 13/14(1995/96), S.22-25
  18. Chongde, W.; Zhe, W.: Evaluation of the models for Bradford's law (1998) 0.01 
    0.010515026 = product of:
  0.052575126 = sum of:
    0.052575126 = weight(_text_:22 in 3688) [ClassicSimilarity], result of:
      0.052575126 = score(doc=3688,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.30952093 = fieldWeight in 3688, 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=3688)
  0.2 = coord(1/5)
    Date
    22. 5.1999 19:12:28
  19. Tijssen, R.J.W.; Wijk, E. van: ¬The global science base of information and communication technologies : bibliometric analysis of ICT research papers (1998) 0.01 
    0.010515026 = product of:
  0.052575126 = sum of:
    0.052575126 = weight(_text_:22 in 3691) [ClassicSimilarity], result of:
      0.052575126 = score(doc=3691,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.30952093 = fieldWeight in 3691, 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=3691)
  0.2 = coord(1/5)
    Date
    22. 5.1999 19:26:54
  20. Thelwall, M.; Ruschenburg, T.: Grundlagen und Forschungsfelder der Webometrie (2006) 0.01 
    0.010515026 = product of:
  0.052575126 = sum of:
    0.052575126 = weight(_text_:22 in 77) [ClassicSimilarity], result of:
      0.052575126 = score(doc=77,freq=2.0), product of:
        0.16985968 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.04850598 = queryNorm
        0.30952093 = fieldWeight in 77, 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=77)
  0.2 = coord(1/5)
    Date
    4.12.2006 12:12:22

Authors

Years

Languages

  • e 110
  • d 8
  • ro 1
  • More… Less…

Types

  • a 117
  • m 2
  • el 1
  • s 1
  • More… Less…

Themes

Subjects

Classifications