Archives des mots-clés : research impact

Delayed Open Access – an overlooked high impact…

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Delayed Open Access – an overlooked high-impact category of openly available scientific literature:

“Delayed open access (OA) refers to scholarly articles in subscription journals made available openly on the web directly through the publisher at the expiry of a set embargo period. Though a substantial number of journals have practiced delayed OA since they started publishing e-versions, empirical studies concerning open access have often overlooked this body of literature. This study provides comprehensive quantitative measurements by identifying delayed OA journals, collecting data concerning their publication volumes, embargo lengths, and citation rates. Altogether 492 journals were identified, publishing a combined total of 111 312 articles in 2011. 77,8 % of these articles were made open access within 12 months from publication, with 85,4 % becoming available within 24 months. A journal impact factor analysis revealed that delayed OA journals have on average twice as high average citation rates compared to closed subscription journals, and three times as high as immediate OA journals. Overall the results demonstrate that delayed OA journals constitute an important segment of the openly available scholarly journal literature, both by their sheer article volume as well as by including a substantial proportion of high impact journals.”

URL : http://hanken.halvi.helsinki.fi/portal/en/publications/delayed-open-access%28a2eb7a79-1078-4657-9d57-4f9f5a1ff228%29.html

Does Online Availability Increase Citations Theory and Evidence…

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Does Online Availability Increase Citations? Theory and Evidence from a Panel of Economics and Business Journals :

“Does online availability boost citations? The answer has implications for issues ranging from the value of a citation to the sustainability of open-access journals. Using panel data on citations to economics and business journals, we show that the enormous effects found in previous studies were an artifact of their failure to control for article quality, disappearing once we add fixed effects as controls. The absence of an aggregate effect masks heterogeneity across platforms: JSTOR stands apart from others, boosting citations around 10%. We examine other sources of heterogeneity including whether JSTOR increases cites from authors in developing more than developed countries and increases cites to “long-tail” more than “superstar” articles. Our theoretical analysis informs the econometric specification and allows us to translate our results for citation increases into welfare terms.”

URL : http://ssrn.com/abstract=1746243

On the impact of Gold Open Access journals…

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On the impact of Gold Open Access journals :

“Gold Open Access (=Open Access publishing) is for many the preferred route to achieve unrestricted and immediate access to research output. However, true Gold Open Access journals are still outnumbered by traditional journals. Moreover availability of Gold OA journals differs from discipline to discipline and often leaves scientists concerned about the impact of these existent titles. This study identified the current set of Gold Open Access journals featuring a Journal Impact Factor (JIF) by means of Ulrichsweb, Directory of Open Access Journals and Journal Citation Reports (JCR). The results were analyzed regarding disciplines, countries, quartiles of the JIF distribution in JCR and publishers. Furthermore the temporal impact evolution was studied for a Top 50 titles list (according to JIF) by means of Journal Impact Factor, SJR and SNIP in the time interval 2000–2010. The identified top Gold Open Access journals proved to be well-established and their impact is generally increasing for all the analyzed indicators. The majority of JCR-indexed OA journals can be assigned to Life Sciences and Medicine. The success-rate for JCR inclusion differs from country to country and is often inversely proportional to the number of national OA journal titles. Compiling a list of JCR-indexed OA journals is a cumbersome task that can only be achieved with non-Thomson Reuters data sources. A corresponding automated feature to produce current lists ‘‘on the fly’’ would be desirable in JCR in order to conveniently track the impact evolution of Gold OA journals.”

URL : https://uscholar.univie.ac.at/view/o:246061

EU FP7 Research in Open Access Repositories …

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EU FP7 Research in Open Access Repositories :

“Open access repositories are a reliable source of academic items that can be used for testing the capabilities of the webometric analysis. This paper deals with actions needed for extracting web indicators from bibliographic records in open access repositories, provides guidelines to support a further webometric study and presents the results of a preliminary web impact evaluation carried out over a sample of 1,386 EU FP7 output papers available from the OpenAIRE database. The European Commission project OpenAIRE aims, among other objectives, to provide impact measures to assess the research performance from repositories contents and, especially, of Special Clause 39 project participants within EU FP7. Using URL citations, title mentions and copies of titles as main web impact indicators, this study suggests that a priori the implementation of the mandatory clause SC39 to encourage open access to European research may be resulted indeed in a greater and more immediate web visibility of these papers.”

URL : http://2012.sticonference.org/Proceedings/vol1/Alvarez_EU_58.pdf

Beyond Citations: Scholars’ Visibility on the Social Web

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Traditionally, scholarly impact and visibility have been measured by counting publications and citations in the scholarly literature. However, increasingly scholars are also visible on the Web, establishing presences in a growing variety of social ecosystems.

But how wide and established is this presence, and how do measures of social Web impact relate to their more traditional counterparts? To answer this, we sampled 57 presenters from the 2010 Leiden STI Conference, gathering publication and citations counts as well as data from the presenters’ Web “footprints.”

We found Web presence widespread and diverse: 84% of scholars had homepages, 70% were on LinkedIn, 23% had public Google Scholar profiles, and 16% were on Twitter. For sampled scholars’ publications, social reference manager bookmarks were compared to Scopus and Web of Science citations; we found that Mendeley covers more than 80% of sampled articles, and that Mendeley bookmarks are significantly correlated (r=.45) to Scopus citation counts.”

URL : http://2012.sticonference.org/Proceedings/vol1/Bar-Ilan_Beyond_98.pdf

F1000, Mendeley and Traditional Bibliometric Indicators

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This article compares the Faculty of 1000 (F1000) quality filtering results and Mendeley usage data with traditional bibliometric indicators, using a sample of 1397 Genomics and Genetics articles published in 2008 selected by F1000 Faculty Members (FMs). Both Mendeley user counts and F1000 article factors (FFas) correlate significantly with citation counts and associated Journal Impact Factors. However, the correlations for Mendeley user counts are much larger than those for FFas.

It may be that F1000 is good at disclosing the merit of an article from an expert practitioner point of view while Mendeley user counts may be more closely related to traditional citation impact. Articles that attract exceptionally many citations are generally disorder or disease related, while those with extremely high social bookmark user counts are mainly historical or introductory.

URL : http://2012.sticonference.org/Proceedings/vol2/Li_F1000_541.pdf