345 citations · 2k across the 154 of their papers we have counts for
8 papers · 2 filters
The new Excellence Indicator in the World Report of the SCImago Institutions Rankings 2011
Lutz Bornmann, Felix de Moya-Anegón, Loet Leydesdorff
The new excellence indicator in the World Report of the SCImago Institutions Rankings (SIR) makes it possible to test differences in the ranking in terms of statistical significanc…
Which cities' paper output and citation impact are above expectation in information science? Some improvements of our previous mapping approaches
Lutz Bornmann, Loet Leydesdorff
Bornmann and Leydesdorff (in press) proposed methods based on Web-of-Science data to identify field-specific excellence in cities where highly-cited papers were published more freq…
Mapping excellence in the geography of science: An approach based on Scopus data
Lutz Bornmann, Loet Leydesdorff, Christiane Walch-Solimena +1
As research becomes an ever more globalized activity, there is growing interest in national and international comparisons of standards and quality in different countries and region…
The Anna Karenina principle: A concept for the explanation of success in science
Lutz Bornmann, Werner Marx
The first sentence of Leo Tolstoy's novel Anna Karenina is: "Happy families are all alike; every unhappy family is unhappy in its own way." Here Tolstoy means that for a family to…
Integrated Impact Indicators (I3) compared with Impact Factors (IFs): An alternative research design with policy implications
Loet Leydesdorff, Lutz Bornmann
In bibliometrics, the association of "impact" with central-tendency statistics is mistaken. Impacts add up, and citation curves should therefore be integrated instead of averaged.…
Which cities produce excellent papers worldwide more than can be expected? A new mapping approach--using Google Maps--based on statistical significance testing
Lutz Bornmann, Loet Leydesdorff
The methods presented in this paper allow for a statistical analysis revealing centers of excellence around the world using programs that are freely available. Based on Web of Scie…
The detection of "hot regions" in the geography of science: A visualization approach by using density maps
Lutz Bornmann, Ludo Waltman
Spatial scientometrics has attracted a lot of attention in the very recent past. The visualization methods (density maps) presented in this paper allow for an analysis revealing re…
Turning the tables in citation analysis one more time: Principles for comparing sets of documents
Loet Leydesdorff, Lutz Bornmann, Rüdiger Mutz +1
We submit newly developed citation impact indicators based not on arithmetic averages of citations but on percentile ranks. Citation distributions are-as a rule-highly skewed and s…