Sombatsompop, N; Markpin, T; Premkamolnetr, N "A modified method for calculating the Impact Factors of journals in ISI Journal Citation Reports: Polymer Science Category in 1997-2001" SCIENTOMETRICS, 60 (2): 217-235 2004

[Eugene Garfield]

E-mail Address: narongrit.som at kmutt.ac.th

Author(s): Sombatsompop, N; Markpin, T; Premkamolnetr, N

Title: A modified method for calculating the Impact Factors of journals in
ISI Journal Citation Reports: Polymer Science Category in 1997-2001

Source: SCIENTOMETRICS, 60 (2): 217-235 2004

Abstract: This article introduces a new modified method for calculating the
impact factor of journals based on the current ISI practice in generating
journal impact factor values. The impact factor value for a journal
calculated by the proposed method, the so-called Cited Half-Life Impact
Factor (CHAL) method, which is based on the ratio of the number of current
year citations of articles from the previous X years to that of articles
published in the previous X years, the X value being equal to the value of
the cited half-life of the journal in the current year. Thirty-four journals
in the Polymer Science Category from the ISI Subject Heading Categories were
selected and examined. Total citations, impact factors and cited half-life
of the 34 journals during the last five years (19972001) were retrieved from
the ISI Journal Citation Reports and were used as the data source for the
calculations in this work, the impact factor values from ISI and CHAL
methods then being compared. The positions of the journals ranked by impact
factors obtained from the ISI method were different from those from the CHAL
method. It was concluded that the CHAL method was more suitable for
calculating the impact factor of the journals than the existing ISI method.
Addresses: KMUTT, P PROF Grp, Sch Energy & Mat, Bangkok 10140, Thailand;
KMUTT, KMUTT Cent Lib, Bangkok, Thailand
Reprint Address: Sombatsompop, N, KMUTT, P PROF Grp, Sch Energy & Mat,
Bangkok 10140, Thailand.


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Times Cited: 0
Publisher: KLUWER ACADEMIC PUBL
Publisher Address: VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN: 0138-9130
Source Item Page Count: 19
ISI Document Delivery No.: 820LE