Section 3: Impact Metrics Comparison Charts

Compare Journal Metrics

SJR Indicator (SCImago) Article Influence (Eigenfactor) Impact Factor (Journal Citation Reports)
Data source Scopus Web of Science Web of Science
Citation window 3 years 5 years 2 years
Self-citation Limited Excluded Unlimited
Access Open Access Open Access Subscription

Adapted from: Gonzalez-Pereira, B., Guerro-Bote, V. and Moya-Anegon, F. The SJR indicator: A new indicator of journals' scientific prestige. Retrieved from: http://arxiv.org/ftp/arxiv/papers/0912/0912.4141.pdf

Compare Citation Data Sources

Web of Science (WoS) Scopus Google Scholar
Access NDSU subscription includes 2 citation indexes: Science Citation Index Expanded — to 1900 and Social Sciences Citation Index – to 1956 NDSU does not subscribe to Scopus. Journal rankings based on Scopus data available using SCImago (open access) Open Access
Updated Weekly 1-2 times a week Monthly on average
Coverage Over 10,000 journals Over 19,000 journals Unknown
Strengths Deep back-files, especially for science journals and relatively accurate citation data Broad coverage of journals. Also indexes peer-reviewed conference proceedings. Covers diverse document types: conference papers, dissertations, book chapters, and technical reports. Good coverage of international materials and languages other than English.
Weaknesses Indexes the fewest sources of the three. Poor international and non-English-language coverage Citation indexing only back to 1996. Poor international and non-English-language coverage Citation errors, incomplete citations, duplication of citations and citations counted from non-scholarly sources (ex: course readings)

Adapted from: http://classguides.lib.uconn.edu/content.php?pid=65261&sid=482290

Further reading:

Meho, L. I. and Yang, K. (2007). Impact of data sources on citation counts and rankings of LIS faculty: Web of Science versus Scopus and Google Scholar. Journal of the American Society for Information Science and Technology 58, 2105–2125. doi: 10.1002/asi.20677. Retrieved from: http://onlinelibrary.wiley.com/doi/10.1002/asi.20677/full