Frandsen TF, Rousseau R. "Article impact calculated over arbitrary periods" JASIST 56(1). January 1 2005 p.58-62

[Eugene Garfield]

T.F. FRANDSEN :  EM kk02tota at db.dk

TITLE:          Article impact calculated over arbitrary periods
                (Article, English)
AUTHOR:         Frandsen, TF; Rousseau, R
SOURCE:         JOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE
                AND TECHNOLOGY 56 (1). JAN 1 2005. p.58-62 JOHN WILEY &
                SONS INC, HOBOKEN

ABSTRACT:       In this paper we address the various formulations of
impact of articles, usually groups of articles as gauged by citations
that these articles receive over a certain period of time. The journal
impact factor, as published by ISI (Philadelphia, PA), is the best-known
example of a formulation of impact of journals (considered as a set of
articles) but many others have been defined in the literature. Impact
factors have varying publication and citation periods and the chosen
length of these periods enables, e.g., a distinction between synchronous
and diachronous impact factors. It is shown how an impact factor for the
general case can be defined. Two alternatives for a general impact factor
are proposed, depending on whether different publication years are seen
as a whole, and hence treating each one of them differently, or by
operating with citation periods of identical length but allowing each
publication period different starting points.

AUTHOR ADDRESS: TF Frandsen, Royal Sch Lib & Informat Sci, Birketinget 6,
                DK-2300 Copenhagen S, Denmark

CITED REFERENCES:
  *MERR, 1993, MERR COLL DICT
   BARNABY DP, 1998, ANN EMERG MED, V31, P78
   BONNEVIE E, 2003, J INFORM SCI, V29, P11
   BORDONS M, 2002, SCIENTOMETRICS, V53, P195
   DEBRUIN RE, 1993, RES EVALUAT, V3, P25
   EGGHE L, 2002, CAN J INFORM LIB SCI, V27, P29
   GARFIELD E, 1963, AM DOC, V14, P195
   GARFIELD E, 1998, SCIENTIST, V12, P10
   GLANZEL W, 2002, SCIENTOMETRICS, V53, P171
   GLANZEL W, 2003, SCIENTOMETRICS, V57, P197
   GOLDER W, 2000, ONKOLOGIE, V23, P73
   HIRST G, 1978, J AM SOC INFORM SCI, V29, P171
   INGWERSEN P, 2000, WEB KNOWLEDGE FESTSC
   INGWERSEN P, 2001, CHINESE SCI BULL, V46, P524
   JIN BH, 1999, SCIENTOMETRICS, V45, P325
   JIN BH, 2002, SCIENTOMETRICS, V54, P145
   MOED HF, 1985, RES POLICY, V14, P131
   RINIA EJ, 2002, SCIENTOMETRICS, V54, P347
   ROUSSEAU R, 1988, INFORMETRICS, V87, P249
   ROUSSEAU R, 1997, P 6 C INT SOC SCI IN, P371
   ROUSSEAU R, 2001, J DOC, V57, P349
   ROUSSEAU R, 2002, LIBR TRENDS, V50, P418
   SEGLEN PO, 1997, BRIT MED J, V314, P497
   STEGMANN J, 1999, J DOC, V55, P310
   TODOROV R, 1988, J INFORM SCI, V14, P47
   WILSON CS, 1999, ANNU REV INFORM SCI, V34, P107
   WU Y, 2003, P 9 INT C SCI INF, P352