Region/World data from SJR.com

[Geoffrey Peters]

The data freely available at: http://www.scimagojr.com/ is very helpful. But
I have recently noticed a discrepancy (either in my understanding in how the
data is put together, or in the data itself). I’m interested if anybody has
an explanation.

It is possible to look at publication output at a regional level. In this
report you get metrics such as #documents, #citable documents, #citations
covering the period 1996- 2009. I understood this to represent, e.g. how
many documents were published which included at least one author from a
given region. I assume that the regional figures would be de-duped so as not
to count collaborating researchers from different countries within the same
region. You also have the corresponding figures at the world level, see
below.



Now while I could understand if the sum of the regional values were greater
than the world totals (a paper from collaborating researchers from different
regions would get counted in multiple regions), it appears that the sums of
the regional values for #documents and  #citable documents are actually
lower than the world values. Is there a simple explanation for this? Is it
simply that 1.3 million citable documents have no country data associated
with them?

Cordially

Geoff
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