Page 196 - Becoming Metric Wise

186 Becoming Metric-Wise

In this subdatabase one can view a ranking over the period [1996, Y ],
or separately by year. The following indicators are available:
• Total number of published documents.
• Total number of citable documents.
• Total number of received citations (ending in Y ).
• Total number of journal self-citations (ending in Y ).
• Citations per document (ending “today”).
• The country h-index
Finally SCImago also provides a ranking per institute: the SCImago
Institutions Ranking (SIR), see http://www.scimagoir.com/
This report contains a list of research institutes and organizations.
Their research over a 5-year period is described in terms of output, col-
laboration and scientific impact. All data come from the Scopus database.
Research institutes and organizations from more than eighty countries are
ranked. They are classified according to five sectors: government (such as
CNRS (France) and CAS (China)), higher education, health, companies
and other.
Elsevier owns the Scopus database which covers over 22,000 titles
from over 5000 publishers (2016 data). Each journal in the database is
assigned to one or more subject classifications, using their “All Science
Journal Classification” (ASJC) codes (referring to entities similar to WoS’
subject areas). A list of ASJC codes can be found at: http://www.scopus.
tk/2016/06/asjc-code-list.html

6.15 PROBLEMS RELATED TO IMPACT FACTORS (MOED,
2005A; STOCK, 2009; VANCLAY, 2012)
We first note that some of these problems are related to the database used,
e.g., coverage, some are related to the mathematical formula used to cal-
culate the JIF, and some are related to the specific way in which Clarivate
Analytics calculates the JIF.
1. Not all academic journals are indexed in the WoS or Scopus. This is a
problem of coverage.
2. Which publications are “citable?” “Normal” research articles are
always considered to be citable as are reviews, but other types of pub-
lications are often considered at an ad hoc basis. This may lead to bias
in favor of journals that publish many letters to the editor or editorials,
and—sometimes—have earned a reputation for the quality of pub-
lished letters or editorials.