new indicator of journal citation impact, denoted as source normalized impact per paper (SNIP).

[Eugene Garfield]

Email: moed at cwts.leidenuniv.nl

------------------------------------------------------------------------

TITLE:          Measuring contextual citation impact of scientific

                journals (Article, English)

AUTHOR:         Moed, HF

SOURCE:         JOURNAL OF INFORMETRICS 4 (3). JUL 2010. p.265-277

                ELSEVIER SCIENCE BV, AMSTERDAM

 

SEARCH TERM(S):  GARFIELD E  rauth;

                 HIRSCH JE          P NATL ACAD SCI USA   102:16569
2005;

                 SEGLEN PO          J AM SOC INFORM SCI    45:1
1994;

                 JOURNALS  item_title; CITATION  item_title;

                 CITATION*  item_title;

                 GARFIELD E         BRIT MED J            313:411
1996;

                 GARFIELD E         SCIENCE               178:471   1972

 

KEYWORDS:       Journal metrics; Journal impact factor; Reference

                practices; Database coverage; Scopus; Source
normalization

KEYWORDS+:       TOOL; SYSTEM; OUTPUT

 

ABSTRACT:       This paper explores a new indicator of journal citation

impact, denoted as source normalized impact per paper (SNIP). It
measures

a journal's contextual citation impact, taking into account

characteristics of its properly defined subject field, especially the

frequency at which authors cite other papers in their reference lists,

the rapidity of maturing of citation impact, and the extent to which a

database used for the assessment covers the field's literature. It

further develops Eugene Garfield's notions of a field's 'citation

potential' defined as the average length of references lists in a field

and determining the probability of being cited, and the need in fair

performance assessments to correct for differences between subject

fields. A journal's subject field is defined as the set of papers citing

that journal. SNIP is defined as the ratio of the journal's citation

count per paper and the citation potential in its subject field. It aims

to allow direct comparison of sources in different subject fields.

Citation potential is shown to vary not only between journal subject

categories - groupings of journals sharing a research field - or

disciplines (e. g., journals in mathematics, engineering and social

sciences tend to have lower values than titles in life sciences), but

also between journals within the same subject category. For instance,

basic journals tend to show higher citation potentials than applied or

clinical journals, and journals covering emerging topics higher than

periodicals in classical subjects or more general journals. SNIP
corrects

for such differences. Its strengths and limitations are critically

discussed, and suggestions are made for further research. All empirical

results are derived from Elsevier's Scopus. (C) 2010 Elsevier Ltd. All

rights reserved.

 

AUTHOR ADDRESS: HF Moed, Leiden Univ, Ctr Sci & Technol Studies CWTS,
POB

                905, NL-2300 AX Leiden, Netherlands

 

[ ]<-- Enter an X to order article (IDS: 607YQ 00007)  ISSN: 1751-1577

 

 

------------------------------------------------------------------------
------------

Eugene Garfield, PhD. email:  garfield at codex.cis.upenn.edu
<mailto:garfield at codex.cis.upenn.edu>  
home page: www.eugenegarfield.org <http://www.eugenegarfield.org/> 
Tel: 610-525-8729 Fax: 610-560-4749

Chairman Emeritus, ThomsonReuters Scientific (formerly ISI)
1500 Spring Garden Street, Philadelphia, PA 19130-4067

Editor Emeritus, The Scientist LLC. www.the-scientist.com
<http://www.the-scientist.com/>    
400 Market St. Suite 330 Philadelphia, PA 19106-2535

Past President, American Society for Information Science and Technology
(ASIS&T) www.asist.org <http://www.asist.org/>  

 

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