Current Percentage of Green and Gold OA

From: Stevan Harnad <amsciforum_at_GMAIL.COM>
Date: Wed, 25 Aug 2010 14:17:58 -0400

On Wed, Aug 25, 2010 at 10:00 AM, Velterop <> wrote:

> Is anyone on this list aware of credible research that shows how many
> articles (in the last 5 years, say), outside physics and the Arxiv
> preprint servers, have been made available with OA exclusively via
> 'green' archiving in respositories, and how many were made available
> with OA directly ('gold') by the publishers (author-side paid or not)?
> The 'gold' OA ones may of course also be available in repositories, but
> shouldn't be counted for this purpose, as their OA status is not due to
> them being 'green' OA.

The percentage of total annual journal article output that is Green OA
has been hovering at about 15% for the past half decade at least. Here
are figures for Green OA only, for a Thomson/Reuters ISI sample of
21,000 control articles. Articles in Gold OA journals were excluded
from the count:

Source: Gargouri, Y., Hajjem, C., Lariviere, V., Gingras, Y., Brody,
T., Carr, L. and Harnad, S. (2010) Self-Selected or Mandated, Open
Access Increases Citation Impact for Higher Quality Research. PLOS ONE
(under review)

Bo-Christer Björk's sample of 1282 Thompson/Reuters ISI articles, he
found much the same percentage Green (14%) but he also had an estimate
of Gold (6.6%). (Since ISI does not index all journals, Björk also
made an estimate for a total sample of 1837 ISI + nonISI journals, and
there the relative percentage for Gold was 8.5% and Green was 11.9%)

Source: Björk B-C, Welling P, Laakso M, Majlender P, Hedlund T, et al.
2010 Open Access to the Scientific Journal Literature: Situation 2009.
PLOS ONE 5(6): e11273. doi:10.1371/journal.pone.0011273 [Table 3]

> It is my hunch (to be verified or falsified) that
> publishers (the 'gold' road) have actually done more to bring OA about
> than repositories, even where mandated (the 'green' road).

I would say that the data above pretty definitively falsify your hunch...

(The 160 institutional and funder mandates so far have not made a
detectable dent in the c. 15% figure, though this may soon change.)

(Do you imagine, though, Jan, that the way most authors are complying
with their institution's or funder's mandate to make make their
articles OA is by publishing them in a Gold OA journal, rather than
publishing them in whatever journal they judge appropriate, and then
depositing the final draft in their OA IR, as the mandates state?)

Stevan Harnad
Received on Wed Aug 25 2010 - 19:19:02 BST

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