Search (144 results, page 1 of 8)

  • × theme_ss:"Citation indexing"
  • × theme_ss:"Informetrie"
  1. Nicolaisen, J.: Citation analysis (2007) 0.06 
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    Date
    13. 7.2008 19:53:22
    Language
    e
  2. Van der Veer Martens, B.: Do citation systems represent theories of truth? (2001) 0.05 
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    Date
    22. 7.2006 15:22:28
    Language
    e
  3. Larivière, V.; Gingras, Y.; Archambault, E.: ¬The decline in the concentration of citations, 1900-2007 (2009) 0.03 
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    Date
    22. 3.2009 19:22:35
    Language
    e
  4. Chan, H.C.; Kim, H.-W.; Tan, W.C.: Information systems citation patterns from International Conference on Information Systems articles (2006) 0.02 
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    Date
    3. 1.2007 17:22:03
    Language
    e
  5. Mingers, J.; Burrell, Q.L.: Modeling citation behavior in Management Science journals (2006) 0.02 
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    Date
    26.12.2007 19:22:05
    Language
    e
  6. Ahlgren, P.; Jarneving, B.; Rousseau, R.: Requirements for a cocitation similarity measure, with special reference to Pearson's correlation coefficient (2003) 0.02 
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    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
    Language
    e
  7. H-Index auch im Web of Science (2008) 0.01 
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    Date
    6. 4.2008 19:04:22
  8. Hayer, L.: Lazarsfeld zitiert : eine bibliometrische Analyse (2008) 0.01 
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    Date
    22. 6.2008 12:54:12
  9. Small, H.; Sweeney, E.: Clustering the Science Citation Index using co-citations (1985) 0.01 
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  10. Garfield, E.: Is citation analysis a legitime evaluation tool? (1979) 0.01 
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  11. Garfield, E.; Sher, I.H.: New factors in the evaluation of scientific literature literature through citation indexing (1963) 0.01 
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  12. ¬The Web of knowledge : Festschrift in honor of Eugene Garfield (2000) 0.00 
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    Biographed
    Garfield, E.
    Footnote
    Rez. in: Knowledge organization 28(2001) no.1, S.45-46 (M.J. López Huertas u. E. Jiménez-Contreras); Password 2002, H.3, S.14-19 (W.G. Stock)
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  13. Garfield, E.: Essays of an information scientist (1977-) 0.00 
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    Footnote
    U.a. Wiedergabe der Beiträge von E. Garfield in der Rubrik 'Current comments' in den 'Current contents'
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  14. Hjerppe, R.: ¬An outline of bibliometrics and citation analysis (1980) 0.00 
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  15. Vinkler, P.: ¬A quasi-quantitative citation model (1987) 0.00 
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  16. Cozzens, S.E.: What do citations count? : the rhetoric-first model (1989) 0.00 
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  17. Peritz, B.C.: Citation characteristics in library science : some further results from a bibliometric survey (1981) 0.00 
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  18. Bensman, S.J.: Garfield and the impact factors (2007) 0.00 
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  19. Peritz, B.C.: ¬A classification of citation roles for the social sciences and related fields (1983) 0.00 
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  20. Shapiro, F.R.: Origins of bibliometrics, citation indexing and citation analysis : the neglected legal literature (1992) 0.00 
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