RePEc in March 2008

April 1, 2008

March is typically a month where all traffic records are beaten on RePEc. Well not this month, but we were close: 694,988 file downloads (less than 3,000 short of the record) and 2,675,511 abstract views (record). The fact that Easter fell in March this year probably has something to do with this. We can thus look forward to a glorious month of April! But we should not be too disappointed, as there is now a RePEc application on Facebook. Look for a big blue letter “R” in the applications menu of your Facebook account.

An uncharacteristically low number of new RePEc archives opened last month, four: Princeton University Press, the Department of Economics at University of Auckland, the Department of University of Malaga, and the Institute of Local Public Finance, Germany. As for the thresholds passed during the last month, we have:

6,000,000 cumulated downloads through EconPapers

3,000,000 references extracted

1,250,000 citations found

175,000 online working papers

140,000 items with references

100,000 cited articles

2,000 listed book chapters

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Posted by Christian Zimmermann

How data is assembled in RePEc

March 30, 2008

RePEc is essentially a large bibliographic database. Thus it needs data about bibliographic items. As RePEc has no employee and can only rely on volunteers, it had to find a way to reduce the cost of data input to a minimum. It succeeded in the sense that this cost is shifted to those that benefit the most from having their publications listed on RePEc: the publishers. We call such publishers “RePEc archive maintainers.” They can be commercial publishers, university presses, economics departments, research centers, central banks, societies or other organizations that have some form of publication relevant to Economics.

This is how RePEc archive maintainers proceed: They maintain sets of flat text files following a particular format called ReDIF. There are different formats for different types of documents. For example, the template describing a working paper would look like this:

Template-Type: ReDIF-Paper 1.0

Author-Name: Hildegrund Muesli

Author-Workplace-Name: University of Upper Elbonia

Author-Name: Adalbrecht Vollkorn

Author-Workplace-Name: Institute for Grandiose Research

Title: The Economics of Gizmos: Grandiose Results

Abstract: Gizmos have become more common with the advent of cybermarkets. This paper explains how banking regulation, demographics and global climate change have increased the demand for gizmos.

Classification-JEL: Z00

Keywords: Location, Location, Location

File-URL: http://www.uelbonia.edu/econ/papers/0803.pdf

Number: 0803

Creation-Date: 2008-02

Handle: RePEc:uel:papers:0803

There are other templates for articles, chapters, books, software components, series and archives. For RePEc-internal uses, people and institutions also have templates, all with unique identifiers (handles) that allow for cross-linking. These templates are then placed on the website or the anonymous ftp site of the publisher, and RePEc services visit them on a regular basis, typically daily, to check for changes. This allows for very fast turn-around times.

Complete instructions on how to proceed to open a RePEc archive can be found here. If your institution is not yet listed among the about 900 participating archives, consider following these instructions.

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Posted by Christian Zimmermann

The Budapest Open Access Initiative

March 22, 2008

The Budapest Open Access Initiative (BOAI) was signed on 14 February 2002. Its goal is to encourage an international effort to make research in all academic fields freely available on the internet. It defines open access as “the world-wide electronic distribution of the peer-reviewed journal literature and completely free and unrestricted access to it by all scientists, scholars, teachers, students, and other curious minds.” This definition is not limited to articles published in journals but also encompasses pre-prints (discussion or workings papers as we call them in Economics).

The Directory of Open Access Journals (DOAJ) list (as of the writing of this post) 3289 journals, including 68 in Economics, that satisfy the requirements of BOAI. While Economics is relatively underrepresented, the working paper culture in our field allows to find in open access many, if not most, of the articles published in non-open access journals (RePEc tries very hard to identify links between different versions of the same work). In fact, most publishers explicitly allow authors to publish pre-prints or post-prints of their articles in institutional repositories, including working papers series. A good list of policies by publishers can be found at RoMEO.

If you think this is a good initiative, you can sign the BOAI here. Foremost, make sure your publications are available in free access through a working papers series, or absent this option, through the Munich Personal RePEc Archive. In particular, in most cases, authors should not remove their working papers once their are published in journals.

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Posted by Christian Zimmermann

Classifying authors

March 16, 2008

A difficult task librarians often face in the classification of items is determining whether authors with similar names are the same person. Indeed, bibliographic records are most of the time very limited in author identification. Take the case of Adam Smith. He may be listed under his full name, which is by no means unique, or worse only as A. Smith, which is easily confused with others. Librarians then rely on context and additional information gathered outside of the bibliographic record to attribute the work to the right person, hopefully without error.

With the large numbers of works now available, such laborious categorization becomes unfeasible, and automatic classification makes numerous errors. Within RePEc, we rely on the authors themselves to perform the classification. When they register in the RePEc Author Service, they have the opportunity to enter all the possible name variations in they may be listed in a bibliographic record. For John Maynard Keynes (who is not registered), such name variations could be:

John Maynard Keynes
John M. Keynes
John Keynes
J. M. Keynes
J. Keynes
Keynes, John Maynard
Keynes, John M.
Keynes, John
Keynes, J. M.
Keynes, J.

In addition, an author may have changed names (through marriage), be listed with a title (Prof., Sir) or with a suffix (Jr, Sr, III). Variations multiply if names have accents, which some publishers do not take into account or encode in the wrong character set. The possibilities are numerous. The registered author is then offered first suggestions of works that match the name variations and then suggestions that offer some close match to name variations (typographical errors happen). The author can then accept these works or reject them.

The RePEc Author Service has so far managed to collect data from close to 16,000 authors who have claimed over 300,000 works as theirs. Such data is in particular used to increase the accuracy of various rankings. And within this set of authors, there is already a large number of homonyms, even when one looks beyond the initial of the first name, which is the precision that some other services have.

If you know of other homonyms in the profession, encourage them to register!

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Posted by Christian Zimmermann

The RePEc budget for 2008

March 9, 2008
  Budget 2007 Effective 2007 Budget 2008
Expenses US$0.00 US$0.00 US$0.00
Revenues US$0.00 US$0.00 US$0.00

Thanks to all our volunteers!

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Posted by Christian Zimmermann

RePEc in February 2008

March 2, 2008

Every month, a short summary of what happened with RePEc is sent to the RePEc-announce mailing list. I also put that message, slightly adapted, on this blog.

During this month, IDEAS moved to a new server sponsored by the Society for Economic Dynamics. It continues to be hosted by the University of Connecticut and is now located on a faster line to the Internet.

In terms of traffic, 613,984 file downloads and 2,246,241 abstract views were recorded within the month, once more significantly up from a year ago. This leads us to the thresholds we have passed this month:

40,000,000 cumulative article abstract views on all RePEc services
25,000,000 cumulative abstract views on EconPapers
300,000 items claimed by registered authors
100,000 JEL codes papers
20,000 unique subscribers in NEP
2,800 journals and series

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Posted by Christian Zimmermann

Volunteer recognition: Thomas Krichel

February 21, 2008

Thomas Krichel is not just a RePEc volunteer, he is RePEc. In 1991, as an research assistant at the Economic Department of Loughborough University, he saw the potential that the Internet gave for the dissemination of research in Economics, but could not manage to get a hold on good data about new working papers. In February 1993, on a lectureship at the University of Surrey, he was more lucky and teamed with Féthy Mili, Economics librarian at the Université de Montréal, who contributed data on 250 series, and Hans Amman (University of Amsterdam), who let Thomas use his coryfee mailing list. Bob Parks soon joined with his Economics Working Paper Archive at Washington University. Thus the NetEc project was launched. It moved to a gopher server at the Manchester Computing Centre in 1993, and then to the web. That year, Thomas also got help in collecting data from José Manuel Barrueco Cruz, Economics librarian at the University of Valencia. But soon they realized that there was too much information out on the Internet for just the two of them to collect.

This is when Thomas suggested the creation of RePEc which would completely decentralize the data input: the publishers, who benefit the most from having their papers listed on web indexes, were to index the works themselves. With the collaboration of Sune Karlsson (SWoPEc, Stockholm School of Economics), Bob Parks and Corry Stuyts (DEGREE, Netherlands), José and Thomas then launched RePEc in June 1997. It still works under the same principles, with great success.

Thomas is still the heart and soul of RePEc. He has his hand in almost every project that is undertaken. After completing his Economics PhD at the University of Surrey, he moved to Long Island University to take a position of assistant professor in … Library Studies. Now tenured, he is an eminence grise in the online provision of bibliographic data and is pushing the RePEc concept into other fields. Within RePEc, most of his attention is currently directed towards NEP, the email notification service on new working papers.

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Posted by Christian Zimmermann

World Ranking of Repositories, RePEc is #2

February 14, 2008

The Webometrics Ranking of World Universities is an initiative that tries to establish which universities provides to most content on the web and get visibility from it. The ranking of universities is based on the size of the web domain (20%), the number of rich files available (PDF, RTF, etc., 15%), Research on Google Scholar (15%), and link visibility (50%). Not surprisingly, US universities monopolize the 24 first spots, led by MIT.

Webometrics also ranks repositories, the criteria being the same as for universities. The ranking is led by Arxiv, the grand-daddy of all repositories covering much of Physics and Mathematics. RePEc is number 2, followed by E-LIS, a repository in Library Sciences founded by Thomas Krichel, who is also at the origin of RePEc!

Other notables down the list: HAL, a French repository that feeds to RePEc at number 9, CDLIB, the University of California Repository, a RePEc participant at number 19, SSRN, not in RePEc, at number 37, the Munich Personal RePEc Archive, barely a year old, is already number 56, and AgEconSearch, not in RePEc, is ranked number 126.

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Posted by Christian Zimmermann

Society for Economic Dynamics sponsors new server for IDEAS

February 7, 2008

IDEAS just moved to a new server sponsored by the Society for Economic Dynamics. The old server, which was sponsored by the College of Liberal Arts and Sciences at the University of Connecticut had been running almost flawlessly since October 2002, but was starting to get overwhelmed by the amount of material now in RePEc and by the heavy traffic and number crunching it entails. While the amount of material more than tripled, the complexity of the data increased much more than that, given the links with authors, references, citations, JEL codes, NEP reports, rankings, institutions, publication compilations, and reading lists.

The new server has more computational power, more memory and especially more disk space. As before, it is hosting IDEAS, EDIRC and QM&RBC. It also hosts the website of the Society of Economic Dynamics, which is willing to sponsor it as it was looking for space to host the datasets and program codes used for articles published in the Review of Economic Dynamics. The server is also set up to provide limited emergency support in case another RePEc service is failing. The hosting continues to be provided by the College of Liberal Arts and Sciences at the University of Connecticut. In particular, Tim Ruggieri from the CLAS Computer Support Group helped with the configuration of the server.

RePEc relies entirely on the support of volunteers in its operations. Contact us if you want to help in one way or the other.

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Posted by Christian Zimmermann

RePEc in January 2008

February 2, 2008

Every month, a short summary of what happened with RePEc is sent to the RePEc-announce mailing list. I also put that message, slightly adapted, on this blog.

The RePEc Author Service was unfortunately down for 10 days. We hope this was only a temporary problem, and full functionalities will be restored soon. The RePEc Blog was very helpful in keeping user abreast of the situation.

Contentwise, a notable addition has been the complete listing of the Journal of Political Economy, starting in 1893. In terms of traffic, 552,272 file downloads and 1,946,427 abstract views were recorded within the month, significantly up from a year ago. This leads us to the thresholds we have passed this month:

90,000,000 abstract views on IDEAS
450,000 online items
275,000 paper announcements through NEP
175,000 items with citations
170,000 online papers
170,000 papers with abstract
80,000 papers with citations
30,000 articles with references
900 books online

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Posted by Christian Zimmermann

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