Search (13 results, page 1 of 1)

  • × author_ss:"Raan, A.F.J. van"
  1. Waltman, L.; Calero-Medina, C.; Kosten, J.; Noyons, E.C.M.; Tijssen, R.J.W.; Eck, N.J. van; Leeuwen, T.N. van; Raan, A.F.J. van; Visser, M.S.; Wouters, P.: ¬The Leiden ranking 2011/2012 : data collection, indicators, and interpretation (2012) 0.06
    0.06030936 = product of:
      0.09046404 = sum of:
        0.024666676 = weight(_text_:j in 514) [ClassicSimilarity], result of:
          0.024666676 = score(doc=514,freq=2.0), product of:
            0.14052401 = queryWeight, product of:
              3.1774964 = idf(docFreq=5010, maxDocs=44218)
              0.044224758 = queryNorm
            0.17553353 = fieldWeight in 514, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.1774964 = idf(docFreq=5010, maxDocs=44218)
              0.0390625 = fieldNorm(doc=514)
        0.065797366 = product of:
          0.13159473 = sum of:
            0.13159473 = weight(_text_:van in 514) [ClassicSimilarity], result of:
              0.13159473 = score(doc=514,freq=6.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.5335859 = fieldWeight in 514, product of:
                  2.4494898 = tf(freq=6.0), with freq of:
                    6.0 = termFreq=6.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=514)
          0.5 = coord(1/2)
      0.6666667 = coord(2/3)
    
  2. Raan, A.F.J. van: Scaling rules in the science system : influence of field-specific citation characteristics on the impact of research groups (2008) 0.05
    0.05496235 = product of:
      0.16488704 = sum of:
        0.16488704 = sum of:
          0.12893598 = weight(_text_:van in 2758) [ClassicSimilarity], result of:
            0.12893598 = score(doc=2758,freq=4.0), product of:
              0.24662332 = queryWeight, product of:
                5.5765896 = idf(docFreq=454, maxDocs=44218)
                0.044224758 = queryNorm
              0.5228053 = fieldWeight in 2758, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                5.5765896 = idf(docFreq=454, maxDocs=44218)
                0.046875 = fieldNorm(doc=2758)
          0.035951063 = weight(_text_:22 in 2758) [ClassicSimilarity], result of:
            0.035951063 = score(doc=2758,freq=2.0), product of:
              0.15486756 = queryWeight, product of:
                3.5018296 = idf(docFreq=3622, maxDocs=44218)
                0.044224758 = queryNorm
              0.23214069 = fieldWeight in 2758, 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=2758)
      0.33333334 = coord(1/3)
    
    Date
    22. 3.2009 19:03:12
    Footnote
    Vgl. auch: Costas, R., M. Bordons u. T.N. van Leeuwen u.a.: Scaling rules in the science system: Influence of field-specific citation characteristics on the impact of individual researchers. In: Journal of the American Society for Information Science and Technology. 60(2009) no.4, S.740-753.
  3. Costas, R.; Bordons, M.; Leeuwen, T.N. van; Raan, A.F.J. van: Scaling rules in the science system : Influence of field-specific citation characteristics on the impact of individual researchers (2009) 0.05
    0.053851318 = product of:
      0.16155395 = sum of:
        0.16155395 = sum of:
          0.13159473 = weight(_text_:van in 2759) [ClassicSimilarity], result of:
            0.13159473 = score(doc=2759,freq=6.0), product of:
              0.24662332 = queryWeight, product of:
                5.5765896 = idf(docFreq=454, maxDocs=44218)
                0.044224758 = queryNorm
              0.5335859 = fieldWeight in 2759, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                5.5765896 = idf(docFreq=454, maxDocs=44218)
                0.0390625 = fieldNorm(doc=2759)
          0.02995922 = weight(_text_:22 in 2759) [ClassicSimilarity], result of:
            0.02995922 = score(doc=2759,freq=2.0), product of:
              0.15486756 = queryWeight, product of:
                3.5018296 = idf(docFreq=3622, maxDocs=44218)
                0.044224758 = queryNorm
              0.19345059 = fieldWeight in 2759, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.5018296 = idf(docFreq=3622, maxDocs=44218)
                0.0390625 = fieldNorm(doc=2759)
      0.33333334 = coord(1/3)
    
    Date
    22. 3.2009 19:02:48
    Footnote
    Vgl. auch: Raan, A.F.J. van: Scaling rules in the science system: influence of field-specific citation characteristics on the impact of research groups. In: Journal of the American Society for Information Science and Technology. 59(2008) no.4, S.565-576.
  4. Raan, A.F.J. van: Statistical properties of bibliometric indicators : research group indicator distributions and correlations (2006) 0.05
    0.047337994 = product of:
      0.14201398 = sum of:
        0.14201398 = sum of:
          0.0911715 = weight(_text_:van in 5275) [ClassicSimilarity], result of:
            0.0911715 = score(doc=5275,freq=2.0), product of:
              0.24662332 = queryWeight, product of:
                5.5765896 = idf(docFreq=454, maxDocs=44218)
                0.044224758 = queryNorm
              0.36967915 = fieldWeight in 5275, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.5765896 = idf(docFreq=454, maxDocs=44218)
                0.046875 = fieldNorm(doc=5275)
          0.050842483 = weight(_text_:22 in 5275) [ClassicSimilarity], result of:
            0.050842483 = score(doc=5275,freq=4.0), product of:
              0.15486756 = queryWeight, product of:
                3.5018296 = idf(docFreq=3622, maxDocs=44218)
                0.044224758 = 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)
      0.33333334 = coord(1/3)
    
    Date
    22. 7.2006 16:20:22
  5. Noyons, E.C.M.; Raan, A.F.J. van: Monitoring scientific developments from a dynamic perspective : self-organized structuring to map neural network research (1998) 0.03
    0.025325416 = product of:
      0.075976245 = sum of:
        0.075976245 = product of:
          0.15195249 = sum of:
            0.15195249 = weight(_text_:van in 331) [ClassicSimilarity], result of:
              0.15195249 = score(doc=331,freq=2.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.6161319 = fieldWeight in 331, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.078125 = fieldNorm(doc=331)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  6. Waltman, L.; Eck, N.J. van; Raan, A.F.J. van: Universality of citation distributions revisited (2012) 0.03
    0.025070883 = product of:
      0.07521265 = sum of:
        0.07521265 = product of:
          0.1504253 = sum of:
            0.1504253 = weight(_text_:van in 4963) [ClassicSimilarity], result of:
              0.1504253 = score(doc=4963,freq=4.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.60993946 = fieldWeight in 4963, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=4963)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  7. Costas, R.; Leeuwen, T.N. van; Raan, A.F.J. van: Is scientific literature subject to a 'Sell-By-Date'? : a general methodology to analyze the 'durability' of scientific documents (2010) 0.02
    0.017907776 = product of:
      0.053723324 = sum of:
        0.053723324 = product of:
          0.10744665 = sum of:
            0.10744665 = weight(_text_:van in 3333) [ClassicSimilarity], result of:
              0.10744665 = score(doc=3333,freq=4.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.43567106 = fieldWeight in 3333, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=3333)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  8. Raan, A.F.J. van: Scientometrics : state of the art (1997) 0.02
    0.017727792 = product of:
      0.053183373 = sum of:
        0.053183373 = product of:
          0.106366746 = sum of:
            0.106366746 = weight(_text_:van in 409) [ClassicSimilarity], result of:
              0.106366746 = score(doc=409,freq=2.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.43129233 = fieldWeight in 409, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=409)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  9. Raan, A.F.J. van: ¬The influence of international collaboration on the impact of research results (1998) 0.02
    0.0151952505 = product of:
      0.04558575 = sum of:
        0.04558575 = product of:
          0.0911715 = sum of:
            0.0911715 = weight(_text_:van in 5120) [ClassicSimilarity], result of:
              0.0911715 = score(doc=5120,freq=2.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.36967915 = fieldWeight in 5120, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.046875 = fieldNorm(doc=5120)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  10. Raan, A.F.J. van; Noyons, E.C.M.: Discovery of patterns of scientific and technological development and knowledge transfer (2002) 0.01
    0.012662708 = product of:
      0.037988123 = sum of:
        0.037988123 = product of:
          0.075976245 = sum of:
            0.075976245 = weight(_text_:van in 3603) [ClassicSimilarity], result of:
              0.075976245 = score(doc=3603,freq=2.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.30806595 = fieldWeight in 3603, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=3603)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  11. Raan, A.F.J. van: Bibliometric statistical properties of the 100 largest European research universities : prevalent scaling rules in the science system (2008) 0.01
    0.012662708 = product of:
      0.037988123 = sum of:
        0.037988123 = product of:
          0.075976245 = sum of:
            0.075976245 = weight(_text_:van in 1372) [ClassicSimilarity], result of:
              0.075976245 = score(doc=1372,freq=2.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.30806595 = fieldWeight in 1372, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=1372)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  12. Raan, A.F.J. van: Self-citation as an impact-reinforcing mechanism in the science system (2008) 0.01
    0.012662708 = product of:
      0.037988123 = sum of:
        0.037988123 = product of:
          0.075976245 = sum of:
            0.075976245 = weight(_text_:van in 2006) [ClassicSimilarity], result of:
              0.075976245 = score(doc=2006,freq=2.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.30806595 = fieldWeight in 2006, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=2006)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)
    
  13. Raan, A.F.J. van: Performance-related differences of bibliometric statistical properties of research groups : cumulative advantages and hierarchically layered networks (2006) 0.01
    0.010130167 = product of:
      0.0303905 = sum of:
        0.0303905 = product of:
          0.060781 = sum of:
            0.060781 = weight(_text_:van in 220) [ClassicSimilarity], result of:
              0.060781 = score(doc=220,freq=2.0), product of:
                0.24662332 = queryWeight, product of:
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.044224758 = queryNorm
                0.24645276 = fieldWeight in 220, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  5.5765896 = idf(docFreq=454, maxDocs=44218)
                  0.03125 = fieldNorm(doc=220)
          0.5 = coord(1/2)
      0.33333334 = coord(1/3)