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Which cities produce worldwide more excellent papers than can be expected? 
A new mapping approach--using Google Maps--based on statistical significance

Abstract: The methods presented in this paper allow for a spatial analysis
revealing centers of excellence around the world using programs that are
freely available. Based on Web of Science data, field-specific excellence
can be identified in cities where highly-cited papers were published.
Compared to the mapping approaches published hitherto, our approach is more
analytically oriented by allowing the assessment of an observed number of
excellent papers for a city against the expected number. With this feature,
this approach can not only identify the top performers in output but the
"true jewels." These are cities locating authors who publish significantly
more top cited papers than can be expected. As the examples in this paper
show for physics, chemistry, and psychology, these cities do not necessarily
have a high output of excellent papers. 

Lutz Bornmann*  & Loet Leydesdorff        
* [log in to unmask] 

** apologies for cross-postings

Loet Leydesdorff 
Amsterdam School of Communications Research (ASCoR), 
Kloveniersburgwal 48, 1012 CX Amsterdam. 
Tel.: +31-20- 525 6598; fax: +31-842239111
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