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Adjusted age distribution and its application to impact factor and immediacy index

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  • Isao Asai

Abstract

For the age count between citing and cited papers, the difference in the year of publication is widely used. In some cases, the frequency obtained is inaccurate because of age bias. This article describes a probabilistic method for adjusting the raw frequency, and its application to the impact factor and immediacy index in journal evaluation. The main procedure is that 1/8 of the raw frequency at any given age is assigned to the previous age and to the following age, respectively. Adjusting the frequency over all ages of use, the curve representing the age distribution becomes smoother.

Suggested Citation

  • Isao Asai, 1981. "Adjusted age distribution and its application to impact factor and immediacy index," Journal of the American Society for Information Science, Association for Information Science & Technology, vol. 32(3), pages 172-174, May.
    • Handle: RePEc:bla:jamest:v:32:y:1981:i:3:p:172-174
    DOI: 10.1002/asi.4630320303
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    Cited by:

    1. Wolfgang Glänzel & Henk F. Moed, 2002. "Journal impact measures in bibliometric research," Scientometrics, Springer;Akadémiai Kiadó, vol. 53(2), pages 171-193, February.
    2. Narongrit Sombatsompop & T. Markpin & N. Premkamolnetr, 2004. "A modified method for calculating the Impact Factors of journals in ISI Journal Citation Reports: Polymer Science Category in 1997–2001," Scientometrics, Springer;Akadémiai Kiadó, vol. 60(2), pages 217-235, June.
    3. Dar-Zen Chen & Chang-Pin Lin & Mu-Hsuan Huang & Chen-Yu Huang, 2010. "Constructing a new patent bibliometric performance measure by using modified citation rate analyses with dynamic backward citation windows," Scientometrics, Springer;Akadémiai Kiadó, vol. 82(1), pages 149-163, January.
    4. Silvia Ferrini, 2007. "L’Impact Factor: luci e ombre," Department of Economic Policy, Finance and Development (DEPFID) University of Siena 002, Department of Economic Policy, Finance and Development (DEPFID), University of Siena.
    5. Dašić Predrag, 2015. "State and Analysis of Scientific Journals in the Field of “Economic Sciences” for the Period 1995-2014," Economic Themes, Sciendo, vol. 53(4), pages 547-581, December.
    6. Wolfgang Glänzel & András Schubert & Bart Thijs & Koenraad Debackere, 2011. "A priori vs. a posteriori normalisation of citation indicators. The case of journal ranking," Scientometrics, Springer;Akadémiai Kiadó, vol. 87(2), pages 415-424, May.

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