Search (105 results, page 1 of 6)

  • × theme_ss:"Citation indexing"
  1. Leydesdorff, L.: Theories of citation? (1999) 0.03 
    0.03492582 = product of:
  0.122240365 = sum of:
    0.1047525 = weight(_text_:interactions in 5130) [ClassicSimilarity], result of:
      0.1047525 = score(doc=5130,freq=2.0), product of:
        0.22965278 = queryWeight, product of:
          5.8977947 = idf(docFreq=329, maxDocs=44218)
          0.038938753 = queryNorm
        0.4561343 = fieldWeight in 5130, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          5.8977947 = idf(docFreq=329, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5130)
    0.017487857 = weight(_text_:with in 5130) [ClassicSimilarity], result of:
      0.017487857 = score(doc=5130,freq=2.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.1863712 = fieldWeight in 5130, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5130)
  0.2857143 = coord(2/7)
    Abstract
    Citations support the communication of specialist knowledge by allowing authors and readers to make specific selections in several contexts at the same time. In the interactions between the social network of authors and the network of their reflexive communications, a sub textual code of communication with a distributed character has emerged. Citation analysis reflects on citation practices. Reference lists are aggregated in scientometric analysis using one of the available contexts to reduce the complexity: geometrical representations of dynamic operations are reflected in corresponding theories of citation. The specific contexts represented in the modern citation can be deconstructed from the perspective of the cultural evolution of scientific communication
  2. Van der Veer Martens, B.: Do citation systems represent theories of truth? (2001) 0.02 
    0.01779635 = product of:
  0.062287226 = sum of:
    0.024982655 = weight(_text_:with in 3925) [ClassicSimilarity], result of:
      0.024982655 = score(doc=3925,freq=2.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2662446 = fieldWeight in 3925, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.078125 = fieldNorm(doc=3925)
    0.037304573 = product of:
      0.074609146 = sum of:
        0.074609146 = weight(_text_:22 in 3925) [ClassicSimilarity], result of:
          0.074609146 = score(doc=3925,freq=4.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = 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)
      0.5 = coord(1/2)
  0.2857143 = coord(2/7)
    Abstract
    Arranged according to subjects the bibliography lists 79 references,mostly with terse abstracts.
    Date
    22. 7.2006 15:22:28
  3. Garfield, E.; Stock, W.G.: Citation Consciousness : Interview with Eugene Garfiels, chairman emeritus of ISI; Philadelphia (2002) 0.01 
    0.014674564 = product of:
  0.051360972 = sum of:
    0.024982655 = weight(_text_:with in 613) [ClassicSimilarity], result of:
      0.024982655 = score(doc=613,freq=2.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2662446 = fieldWeight in 613, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.078125 = fieldNorm(doc=613)
    0.026378317 = product of:
      0.052756634 = sum of:
        0.052756634 = weight(_text_:22 in 613) [ClassicSimilarity], result of:
          0.052756634 = score(doc=613,freq=2.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = queryNorm
            0.38690117 = fieldWeight in 613, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.078125 = fieldNorm(doc=613)
      0.5 = coord(1/2)
  0.2857143 = coord(2/7)
    Source
    Password. 2002, H.6, S.22-25
  4. Larivière, V.; Gingras, Y.; Archambault, E.: ¬The decline in the concentration of citations, 1900-2007 (2009) 0.01 
    0.010677812 = product of:
  0.03737234 = sum of:
    0.014989593 = weight(_text_:with in 2763) [ClassicSimilarity], result of:
      0.014989593 = score(doc=2763,freq=2.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.15974675 = fieldWeight in 2763, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.046875 = fieldNorm(doc=2763)
    0.022382746 = product of:
      0.04476549 = sum of:
        0.04476549 = weight(_text_:22 in 2763) [ClassicSimilarity], result of:
          0.04476549 = score(doc=2763,freq=4.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = 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)
      0.5 = coord(1/2)
  0.2857143 = coord(2/7)
    Abstract
    This article challenges recent research (Evans, 2008) reporting that the concentration of cited scientific literature increases with the online availability of articles and journals. Using Thomson Reuters' Web of Science, the present article analyses changes in the concentration of citations received (2- and 5-year citation windows) by papers published between 1900 and 2005. Three measures of concentration are used: the percentage of papers that received at least one citation (cited papers); the percentage of papers needed to account for 20%, 50%, and 80% of the citations; and the Herfindahl-Hirschman index (HHI). These measures are used for four broad disciplines: natural sciences and engineering, medical fields, social sciences, and the humanities. All these measures converge and show that, contrary to what was reported by Evans, the dispersion of citations is actually increasing.
    Date
    22. 3.2009 19:22:35
  5. Mingers, J.; Burrell, Q.L.: Modeling citation behavior in Management Science journals (2006) 0.01 
    0.010578708 = product of:
  0.037025474 = sum of:
    0.021198487 = weight(_text_:with in 994) [ClassicSimilarity], result of:
      0.021198487 = score(doc=994,freq=4.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.22591603 = fieldWeight in 994, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.046875 = fieldNorm(doc=994)
    0.015826989 = product of:
      0.031653978 = sum of:
        0.031653978 = weight(_text_:22 in 994) [ClassicSimilarity], result of:
          0.031653978 = score(doc=994,freq=2.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = 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)
  0.2857143 = coord(2/7)
    Abstract
    Citation rates are becoming increasingly important in judging the research quality of journals, institutions and departments, and individual faculty. This paper looks at the pattern of citations across different management science journals and over time. A stochastic model is proposed which views the generating mechanism of citations as a gamma mixture of Poisson processes generating overall a negative binomial distribution. This is tested empirically with a large sample of papers published in 1990 from six management science journals and found to fit well. The model is extended to include obsolescence, i.e., that the citation rate for a paper varies over its cited lifetime. This leads to the additional citations distribution which shows that future citations are a linear function of past citations with a time-dependent and decreasing slope. This is also verified empirically in a way that allows different obsolescence functions to be fitted to the data. Conclusions concerning the predictability of future citations, and future research in this area are discussed.
    Date
    26.12.2007 19:22:05
  6. Van der Veer Martens, B.; Goodrum, G.: ¬The diffusion of theories : a functional approach (2006) 0.01 
    0.010272195 = product of:
  0.03595268 = sum of:
    0.017487857 = weight(_text_:with in 5269) [ClassicSimilarity], result of:
      0.017487857 = score(doc=5269,freq=2.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.1863712 = fieldWeight in 5269, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5269)
    0.018464822 = product of:
      0.036929645 = sum of:
        0.036929645 = weight(_text_:22 in 5269) [ClassicSimilarity], result of:
          0.036929645 = score(doc=5269,freq=2.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = queryNorm
            0.2708308 = fieldWeight in 5269, 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=5269)
      0.5 = coord(1/2)
  0.2857143 = coord(2/7)
    Abstract
    This comparative case study of the diffusion and nondiffusion over time of eight theories in the social sciences uses citation analysis, citation context analysis, content analysis, surveys of editorial review boards, and personal interviews with theorists to develop a model of the theory functions that facilitate theory diffusion throughout specific intellectual communities. Unlike previous work on the diffusion of theories as innovations, this theory functions model differs in several important respects from the findings of previous studies that employed Everett Rogers's classic typology of innovation characteristics that promote diffusion. The model is also presented as a contribution to a more integrated theory of citation.
    Date
    22. 7.2006 15:20:01
  7. Ma, N.; Guan, J.; Zhao, Y.: Bringing PageRank to the citation analysis (2008) 0.01 
    0.008804738 = product of:
  0.030816581 = sum of:
    0.014989593 = weight(_text_:with in 2064) [ClassicSimilarity], result of:
      0.014989593 = score(doc=2064,freq=2.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.15974675 = fieldWeight in 2064, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.046875 = fieldNorm(doc=2064)
    0.015826989 = product of:
      0.031653978 = sum of:
        0.031653978 = weight(_text_:22 in 2064) [ClassicSimilarity], result of:
          0.031653978 = score(doc=2064,freq=2.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = queryNorm
            0.23214069 = fieldWeight in 2064, 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=2064)
      0.5 = coord(1/2)
  0.2857143 = coord(2/7)
    Abstract
    The paper attempts to provide an alternative method for measuring the importance of scientific papers based on the Google's PageRank. The method is a meaningful extension of the common integer counting of citations and is then experimented for bringing PageRank to the citation analysis in a large citation network. It offers a more integrated picture of the publications' influence in a specific field. We firstly calculate the PageRanks of scientific papers. The distributional characteristics and comparison with the traditionally used number of citations are then analyzed in detail. Furthermore, the PageRank is implemented in the evaluation of research influence for several countries in the field of Biochemistry and Molecular Biology during the time period of 2000-2005. Finally, some advantages of bringing PageRank to the citation analysis are concluded.
    Date
    31. 7.2008 14:22:05
  8. Brooks, T.A.: How good are the best papers of JASIS? (2000) 0.01 
    0.008396085 = product of:
  0.058772597 = sum of:
    0.058772597 = product of:
      0.117545195 = sum of:
        0.117545195 = weight(_text_:humans in 4593) [ClassicSimilarity], result of:
          0.117545195 = score(doc=4593,freq=2.0), product of:
            0.26276368 = queryWeight, product of:
              6.7481275 = idf(docFreq=140, maxDocs=44218)
              0.038938753 = queryNorm
            0.44734186 = fieldWeight in 4593, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              6.7481275 = idf(docFreq=140, maxDocs=44218)
              0.046875 = fieldNorm(doc=4593)
      0.5 = coord(1/2)
  0.14285715 = coord(1/7)
    Content
    Top by numbers of citations: (1) Saracevic, T. et al.: A study of information seeking and retrieving I-III (1988); (2) Bates, M.: Information search tactics (1979); (3) Cooper, W.S.: On selecting a measure of retrieval effectiveness (1973); (4) Marcus, R.S.: A experimental comparison of the effectiveness of computers and humans as search intermediaries (1983); (4) Fidel, R.: Online searching styles (1984)
  9. Chen, C.; Cribbin, T.; Macredie, R.; Morar, S.: Visualizing and tracking the growth of competing paradigms : two case studies (2002) 0.01 
    0.008396085 = product of:
  0.058772597 = sum of:
    0.058772597 = product of:
      0.117545195 = sum of:
        0.117545195 = weight(_text_:humans in 602) [ClassicSimilarity], result of:
          0.117545195 = score(doc=602,freq=2.0), product of:
            0.26276368 = queryWeight, product of:
              6.7481275 = idf(docFreq=140, maxDocs=44218)
              0.038938753 = queryNorm
            0.44734186 = fieldWeight in 602, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              6.7481275 = idf(docFreq=140, maxDocs=44218)
              0.046875 = fieldNorm(doc=602)
      0.5 = coord(1/2)
  0.14285715 = coord(1/7)
    Abstract
    In this article we demonstrate the use of an integrative approach to visualizing and tracking the development of scientific paradigms. This approach is designed to reveal the long-term process of competing scientific paradigms. We assume that a cluster of highly cited and cocited scientific publications in a cocitation network represents the core of a predominant scientific paradigm. The growth of a paradigm is depicted and animated through the rise of citation rates and the movement of its core cluster towards the center of the cocitation network. We study two cases of competing scientific paradigms in the real world: (1) the causes of mass extinctions, and (2) the connections between mad cow disease and a new variant of a brain disease in humans-vCJD. Various theoretical and practical issues concerning this approach are discussed.
  10. Ahlgren, P.; Jarneving, B.; Rousseau, R.: Requirements for a cocitation similarity measure, with special reference to Pearson's correlation coefficient (2003) 0.01 
    0.007959949 = product of:
  0.027859818 = sum of:
    0.017308492 = weight(_text_:with in 5171) [ClassicSimilarity], result of:
      0.017308492 = score(doc=5171,freq=6.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.18445967 = fieldWeight in 5171, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.03125 = fieldNorm(doc=5171)
    0.010551327 = product of:
      0.021102654 = sum of:
        0.021102654 = weight(_text_:22 in 5171) [ClassicSimilarity], result of:
          0.021102654 = score(doc=5171,freq=2.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = queryNorm
            0.15476047 = fieldWeight in 5171, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.03125 = fieldNorm(doc=5171)
      0.5 = coord(1/2)
  0.2857143 = coord(2/7)
    Abstract
    Ahlgren, Jarneving, and. Rousseau review accepted procedures for author co-citation analysis first pointing out that since in the raw data matrix the row and column values are identical i,e, the co-citation count of two authors, there is no clear choice for diagonal values. They suggest the number of times an author has been co-cited with himself excluding self citation rather than the common treatment as zeros or as missing values. When the matrix is converted to a similarity matrix the normal procedure is to create a matrix of Pearson's r coefficients between data vectors. Ranking by r and by co-citation frequency and by intuition can easily yield three different orders. It would seem necessary that the adding of zeros to the matrix will not affect the value or the relative order of similarity measures but it is shown that this is not the case with Pearson's r. Using 913 bibliographic descriptions form the Web of Science of articles form JASIS and Scientometrics, authors names were extracted, edited and 12 information retrieval authors and 12 bibliometric authors each from the top 100 most cited were selected. Co-citation and r value (diagonal elements treated as missing) matrices were constructed, and then reconstructed in expanded form. Adding zeros can both change the r value and the ordering of the authors based upon that value. A chi-squared distance measure would not violate these requirements, nor would the cosine coefficient. It is also argued that co-citation data is ordinal data since there is no assurance of an absolute zero number of co-citations, and thus Pearson is not appropriate. The number of ties in co-citation data make the use of the Spearman rank order coefficient problematic.
    Date
    9. 7.2006 10:22:35
  11. Nicolaisen, J.: Citation analysis (2007) 0.01 
    0.0060293297 = product of:
  0.042205308 = sum of:
    0.042205308 = product of:
      0.084410615 = sum of:
        0.084410615 = weight(_text_:22 in 6091) [ClassicSimilarity], result of:
          0.084410615 = score(doc=6091,freq=2.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = 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)
      0.5 = coord(1/2)
  0.14285715 = coord(1/7)
    Date
    13. 7.2008 19:53:22
  12. Døsen, K.: One more reference on self-reference (1992) 0.01 
    0.0060293297 = product of:
  0.042205308 = sum of:
    0.042205308 = product of:
      0.084410615 = sum of:
        0.084410615 = weight(_text_:22 in 4604) [ClassicSimilarity], result of:
          0.084410615 = score(doc=4604,freq=2.0), product of:
            0.13635688 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.038938753 = queryNorm
            0.61904186 = fieldWeight in 4604, 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=4604)
      0.5 = coord(1/2)
  0.14285715 = coord(1/7)
    Date
    7. 2.2005 14:10:22
  13. Garfield, E.: Agony and ecstasy of the Internet : experiences of an information scientist qua publisher (1996) 0.00 
    0.0049965307 = product of:
  0.034975715 = sum of:
    0.034975715 = weight(_text_:with in 3044) [ClassicSimilarity], result of:
      0.034975715 = score(doc=3044,freq=8.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.3727424 = fieldWeight in 3044, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0546875 = fieldNorm(doc=3044)
  0.14285715 = coord(1/7)
    Abstract
    Reports recent experiences with the publishing, via the Internet and WWW of ISI's biweekly newspaper, The Scientist; which was originally mounted on the NSFnet. Compares the use of the Internet for SDI by comparing Web searches via AltaVista with similar searches on CD-ROM. Predicts that future current awareness services and SDI services will be linked to electronic periodicals in electronic libraries. Concludes with a note on cited reference searching, a variation on the theme of hypertext searching, with particular reference to SCI and Web crawlers
  14. Feitelson, D.G.; Yovel, U.: Predictive ranking of computer scientists using CiteSeer data (2004) 0.00 
    0.004327123 = product of:
  0.03028986 = sum of:
    0.03028986 = weight(_text_:with in 1259) [ClassicSimilarity], result of:
      0.03028986 = score(doc=1259,freq=6.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.32280442 = fieldWeight in 1259, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0546875 = fieldNorm(doc=1259)
  0.14285715 = coord(1/7)
    Abstract
    The increasing availability of digital libraries with cross-citation data on the Internet enables new studies in bibliometrics. The paper focuses on the list of 10.000 top-cited authors in computer science available as part of CiteSeer. Using data from several consecutive lists a model of how authors accrue citations with time is constructed. By comparing the rate at which individual authors accrue citations with the average rate, predictions are made of how their ranking in the list will change in the future.
  15. Raan, A.F.J. van: Self-citation as an impact-reinforcing mechanism in the science system (2008) 0.00 
    0.0039902087 = product of:
  0.02793146 = sum of:
    0.02793146 = weight(_text_:with in 2006) [ClassicSimilarity], result of:
      0.02793146 = score(doc=2006,freq=10.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2976705 = fieldWeight in 2006, product of:
          3.1622777 = tf(freq=10.0), with freq of:
            10.0 = termFreq=10.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0390625 = fieldNorm(doc=2006)
  0.14285715 = coord(1/7)
    Abstract
    Previous research has demonstrated that lower performance groups have a larger size-dependent cumulative advantage for receiving citations than do top-performance groups. Furthermore, regardless of performance, larger groups have less not-cited publications. Particularly for the lower performance groups, the fraction of not-cited publications decreases considerably with size. These phenomena can be explained with a model in which self-citation acts as a promotion mechanism for external citations. In this article, we show that for self-citations, similar size-dependent scaling rules apply as for citations, but generally the power law exponents are higher for self-citations as compared to citations. We also find that the fraction of self-citations is smaller for the higher performance groups, and this fraction decreases more rapidly with increasing journal impact than that for lower performance groups. An interesting novel finding is that the variance in the correlation of the number of self-citations with size is considerably less than the variance for external citations. This is a clear indication that size is a stronger determinant for self-citations than it is for external citations. Both higher and particularly lower performance groups have a size-dependent cumulative advantage for self-citations, but for the higher performance groups only in the lower impact journals and in fields with low citation density.
  16. Malanga, G.: Classifying and screening journal literature with citation data (1982) 0.00 
    0.003568951 = product of:
  0.024982655 = sum of:
    0.024982655 = weight(_text_:with in 553) [ClassicSimilarity], result of:
      0.024982655 = score(doc=553,freq=2.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2662446 = fieldWeight in 553, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.078125 = fieldNorm(doc=553)
  0.14285715 = coord(1/7)
  17. Thelwall, M.: Extracting macroscopic information from Web links (2001) 0.00 
    0.003568951 = product of:
  0.024982655 = sum of:
    0.024982655 = weight(_text_:with in 6851) [ClassicSimilarity], result of:
      0.024982655 = score(doc=6851,freq=8.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2662446 = fieldWeight in 6851, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0390625 = fieldNorm(doc=6851)
  0.14285715 = coord(1/7)
    Abstract
    Much has been written about the potential and pitfalls of macroscopic Web-based link analysis, yet there have been no studies that have provided clear statistical evidence that any of the proposed calculations can produce results over large areas of the Web that correlate with phenomena external to the Internet. This article attempts to provide such evidence through an evaluation of Ingwersen's (1998) proposed external Web Impact Factor (WIF) for the original use of the Web: the interlinking of academic research. In particular, it studies the case of the relationship between academic hyperlinks and research activity for universities in Britain, a country chosen for its variety of institutions and the existence of an official government rating exercise for research. After reviewing the numerous reasons why link counts may be unreliable, it demonstrates that four different WIFs do, in fact, correlate with the conventional academic research measures. The WIF delivering the greatest correlation with research rankings was the ratio of Web pages with links pointing at research-based pages to faculty numbers. The scarcity of links to electronic academic papers in the data set suggests that, in contrast to citation analysis, this WIF is measuring the reputations of universities and their scholars, rather than the quality of their publications
  18. Wilson, C.S.; Tenopir, C.: Local citation analysis, publishing and reading patterns : using multiple methods to evaluate faculty use of an academic library's research collection (2008) 0.00 
    0.003568951 = product of:
  0.024982655 = sum of:
    0.024982655 = weight(_text_:with in 1960) [ClassicSimilarity], result of:
      0.024982655 = score(doc=1960,freq=8.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2662446 = fieldWeight in 1960, product of:
          2.828427 = tf(freq=8.0), with freq of:
            8.0 = termFreq=8.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0390625 = fieldNorm(doc=1960)
  0.14285715 = coord(1/7)
    Abstract
    This study assessed the intermix of local citation analysis and survey of journal use and reading patterns for evaluating an academic library's research collection. Journal articles and their cited references from faculties at the University of New South Wales were downloaded from the Web of Science (WoS) and journal impact factors from the Journal Citation Reports. The survey of the University of New South Wales (UNSW) academic staff asked both reader-related and reading-related questions. Both methods showed that academics in medicine published more and had more coauthors per paper than academics in the other faculties; however, when correlated with the number of students and academic staff, science published more and engineering published in higher impact journals. When recalled numbers of articles published were compared to actual numbers, all faculties over-estimated their productivity by nearly two-fold. The distribution of cited serial references was highly skewed with over half of the titles cited only once. The survey results corresponded with U.S. university surveys with one exception: Engineering academics reported the highest number of article readings and read mostly for research related activities. Citation analysis data showed that the UNSW library provided the majority of journals in which researchers published and cited, mostly in electronic formats. However, the availability of non-journal cited sources was low. The joint methods provided both confirmatory and contradictory results and proved useful in evaluating library research collections.
  19. Vaughan, L.; Shaw , D.: Bibliographic and Web citations : what Is the difference? (2003) 0.00 
    0.0030908023 = product of:
  0.021635616 = sum of:
    0.021635616 = weight(_text_:with in 5176) [ClassicSimilarity], result of:
      0.021635616 = score(doc=5176,freq=6.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2305746 = fieldWeight in 5176, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0390625 = fieldNorm(doc=5176)
  0.14285715 = coord(1/7)
    Abstract
    Vaughn, and Shaw look at the relationship between traditional citation and Web citation (not hyperlinks but rather textual mentions of published papers). Using English language research journals in ISI's 2000 Journal Citation Report - Information and Library Science category - 1209 full length papers published in 1997 in 46 journals were identified. Each was searched in Social Science Citation Index and on the Web using Google phrase search by entering the title in quotation marks, and followed for distinction where necessary with sub-titles, author's names, and journal title words. After removing obvious false drops, the number of web sites was recorded for comparison with the SSCI counts. A second sample from 1992 was also collected for examination. There were a total of 16,371 web citations to the selected papers. The top and bottom ranked four journals were then examined and every third citation to every third paper was selected and classified as to source type, domain, and country of origin. Web counts are much higher than ISI citation counts. Of the 46 journals from 1997, 26 demonstrated a significant correlation between Web and traditional citation counts, and 11 of the 15 in the 1992 sample also showed significant correlation. Journal impact factor in 1998 and 1999 correlated significantly with average Web citations per journal in the 1997 data, but at a low level. Thirty percent of web citations come from other papers posted on the web, and 30percent from listings of web based bibliographic services, while twelve percent come from class reading lists. High web citation journals often have web accessible tables of content.
  20. Leydesdorff, L.; Moya-Anegón, F.de; Guerrero-Bote, V.P.: Journal maps on the basis of Scopus data : a comparison with the Journal Citation Reports of the ISI (2010) 0.00 
    0.0030908023 = product of:
  0.021635616 = sum of:
    0.021635616 = weight(_text_:with in 3335) [ClassicSimilarity], result of:
      0.021635616 = score(doc=3335,freq=6.0), product of:
        0.09383348 = queryWeight, product of:
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.038938753 = queryNorm
        0.2305746 = fieldWeight in 3335, product of:
          2.4494898 = tf(freq=6.0), with freq of:
            6.0 = termFreq=6.0
          2.409771 = idf(docFreq=10797, maxDocs=44218)
          0.0390625 = fieldNorm(doc=3335)
  0.14285715 = coord(1/7)
    Abstract
    Using the Scopus dataset (1996-2007) a grand matrix of aggregated journal-journal citations was constructed. This matrix can be compared in terms of the network structures with the matrix contained in the Journal Citation Reports (JCR) of the Institute of Scientific Information (ISI). Because the Scopus database contains a larger number of journals and covers the humanities, one would expect richer maps. However, the matrix is in this case sparser than in the case of the ISI data. This is because of (a) the larger number of journals covered by Scopus and (b) the historical record of citations older than 10 years contained in the ISI database. When the data is highly structured, as in the case of large journals, the maps are comparable, although one may have to vary a threshold (because of the differences in densities). In the case of interdisciplinary journals and journals in the social sciences and humanities, the new database does not add a lot to what is possible with the ISI databases.

Authors

Years

Languages

  • e 99
  • d 6
  • More… Less…

Types

  • a 104
  • el 4
  • m 1
  • More… Less…

Themes