Jarvelin, K; Persson, O The DCI index: Discounted cumulated impact-based research evaluation JOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE AND TECHNOLOGY, 59 (9): 1433-1440 JUL 2008

[Eugene Garfield]

E-mail Address: kalervo.jarvelin at uta.fi; Olle.Persson at soc.umu.se

Author(s): Jarvelin, K (Jarvelin, Kalervo); Persson, O (Persson, Olle) 

Title: The DCI index: Discounted cumulated impact-based research 
evaluation 

Source: JOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE AND 
TECHNOLOGY, 59 (9): 1433-1440 JUL 2008 

Language: English 

Document Type: Article 

Keywords Plus: H-INDEX; HIRSCH-INDEX; INFORMATION-SCIENCE 

Abstract: Research evaluation is increasingly popular and important among 
research funding bodies and science policy makers. Various indicators have 
been proposed to evaluate the standing of individual scientists, 
institutions, journals, or countries. A simple and popular one among the 
indicators is the h-index, the Hirsch index (Hirsch 2005), which is an 
indicator for lifetime achievement of a scholar. Several other indicators 
have been proposed to complement or balance the h-index. However, these 
indicators have no conception of aging. The AR-index (Jin et al. 2007) 
incorporates aging but divides the received citation counts by the raw age 
of the publication. Consequently, the decay of a publication is very steep 
and insensitive to disciplinary differences. In addition, we believe that 
a publication becomes outdated only when it is no longer cited, not 
because of its age. Finally, all indicators treat citations as equally 
material when one might reasonably think that a citation from a heavily 
cited publication should weigh more than a citation froma non-cited or 
little-cited publication. We propose a new indicator, the Discounted 
Cumulated Impact (DCI) index, which devalues old citations in a smooth 
way. It rewards an author for receiving new citations even if the 
publication is old. Further, it allows weighting of the citations by the 
citation weight of the citing publication. DCI can be used to calculate 
research performance on the basis of the h-core of a scholar or any other 
publication data set. Finally, it supports comparing research performance 
to the average performance in the domain and across domains as well. 

Addresses: Umea Univ, Inst Sociol, S-90187 Umea, Sweden 

Reprint Address: Jarvelin, K, Univ Tampere, Dept Informat Studies, FIN-
33014 Tampere, Finland. 

E-mail Address: kalervo.jarvelin at uta.fi; Olle.Persson at soc.umu.se 

Cited Reference Count: 18 

Times Cited: 0 

Publisher: JOHN WILEY & SONS INC 

Publisher Address: 111 RIVER ST, HOBOKEN, NJ 07030 USA 

ISSN: 1532-2882 

DOI: 10.1002/asi.20847 

29-char Source Abbrev.: J AM SOC INF SCI TECHNOL 

ISO Source Abbrev.: J. Am. Soc. Inf. Sci. Technol.
 
Source Item Page Count: 8 

Subject Category: Computer Science, Information Systems; Information 
Science & Library Science 

ISI Document Delivery No.: 319MQ 

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