Citation Data and Web Analysis

CITATION DATA AND WEB ANALYSIS:

h-Index, g-Index, hc-Index and others:

• Analysis of citation data, rather than just its collection, has become a value-added service of some databases now.

  • h-Index:

    • Measures impact / research contribution of individual or group of researchers

    • h-index of 15, for example, means that there are 15 items that have been cited 15 or more times

    • Value will only increase over period of researcher's career

    • Can only compare h-indices of researchers in same field

    • In Web of Science, the Citation Report includes the h-index

    • More information about the h-index

  • g-index:

    • Introduced as an improvement of the h-index which "is insensitive to one or several outstandingly highly cited papers" (Gibbs, 2006, p.31)

    • Measures the global citation performance of set of articles

    • If set is ranked in decreasing order of the number of citations that they received, the g-index is the (unique) largest number such that the top g articles received (together) at least g² citations.

    • A set of papers has a g-index of g if g is the highest rank, such that the top g papers have, together, at least g²citations

    • More information about g-index

• Contemporary h-index (hc-index)

  • • Based on the h-index, with an age-related weighting to each cited article

    • More information about hc-index

• Publish or Perish

  • • a computer program that analyses data from Google Scholar

    • reveals h-index, g-index and average numbers of citations per author, paper, year etc.

    • enables comparison between these data and those for the same author(s), found in Scopus and Web of Science.