Do Open-Access Articles Have a Greater Research Impact? (fwd)

Stevan Harnad harnad at ECS.SOTON.AC.UK
Wed Oct 20 14:08:51 EDT 2004

---------- Forwarded message ----------
Date: Wed, 20 Oct 2004 19:01:03 +0100
From: Chawki Hajjem <hajjem at>
Subject: Re: Do Open-Access Articles Have a Greater Research Impact?

Below is the latest evidence that the Open Access Impact Advantage is
neither unique to the Physical Sciences and Mathematics:

nor to the Biological Sciences:

The Impact advantage is there in the Social Sciences too:

The explanation for
is so far only in French (it will be translated shortly)
but the English explanation for
applies to the Social Science data too.

Note that one significant difference between the Physical Sciences and
the Social Sciences is that the rate of self-archiving is not increasing
in the Social Sciences yet (correlation between number of OA
articles and Year is positive for Physics/Mathematics, negative for
Sociology/Anthropology). The OA impact effect is always positive except
in the most recent year (2003), probably because the ISI citation counts
are not yet up to date for 2003.

Chawki Hajjem
Doctoral Candidate
Informatique cognitive
Centre de neuroscience de la cognition (CNC)
Université du Québec à Montréal
Montréal, Québec,  Canada  H3C 3P8
tel: 1-514-987-3000 2297#
fax: 1-514-987-8952

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