Lutz Bornmann and Loet Leydesdorff
recently published a paper whose
results are maps displaying the relative numbers of science papers each
city of origin has cited by other science papers. Chemistry, physics,
and psychology categories are given. A detailed explanation of how the
maps are generated is provided, including how circle sizes are calculated
and how colors are assigned, based on statistical analysis. If the
is greater than the
, green is assigned. If the observed value is less
than the expected value, red is assigned. Where is that huge red circle?
Moscow. Its size means the number of published papers from Moscow relative
to the number of papers that cite those papers is high; i.e., Muscovites
do a lot of writing citing other sources, but not many writers cite
papers from Muscovites. A big green circle is what you really want -
like Cambridge, Mass. (not Cambridge,
Idaho, as plotted)
, which is home to MIT, Harvard, and U. Mass,
as well as many high-tech, highly published companies like Raytheon
and Skyworks. Other big producers in the U.S. are Chicago/Urbana, Ill.
(Motorola, Fermilab), and Berkely (Silicon Valley). In Europe, London
(Cambridge U.) is the stand-out performer, with Paris, France, and Munich,
Germany, following. Hefei, China, with three national physics laboratories,
beats out even Hong Kong. The Tokyo region of Japan dominates the Pacific
island realm, while Singapore rules SE Asia. It is worth taking a couple
minutes to read through the paper ("Which
cities produce worldwide excellent papers more than can be expected?
A new mapping approach—using Google Maps—based on statistical significance
) to learn how the creators arrived at the maps.
Map of Cities
with Largest Number of Cited Physics Papers
I tried using the provided data file at
as input for the
program from Google, but the result (see below) was
not what is presented by the authors... so I gave up.