Eigenfactor ovvero il ranking dei periodici all’epoca di Google

header.jpg

L’Impact factor è un indicatore che sta assumendo sempre maggiore importanza (e sta anche snaturando la sua natura inziale), ma il fronte di coloro che, giustamente, muovono critiche si va allargando sempre di più.

Per questo motivo guardiamo con interesse a questa iniziativa della Università di Washington: EIGENFACTOR.ORG http://www.eigenfactor.org/index.php

Il database comprende riviste scientifiche (ISI e non ISI), tesi di dottorato, ma anche giornali e riviste “leggere” (vedi nella quick top Ten la sezione top five magazines you might find on an airplane)

Si basa, per il ranking, su un algoritmo simile a quello di Google

whyeigenfig1.jpg

Applica dei correttivi al “peso” delle citazioni.

Different disciplines have different standards for citation and different time scales on which citations occur. The average article in a leading cell biology journal might receive 10-30 citations within two years; the average article in leading mathematics journal would do very well to receive 2 citations over the same period. By using the whole citation network, Eigenfactor automatically accounts for these differences and allows better comparison across research areas.

Si basa su un periodo temporale diverso e più ampio rispetto a quello calcolato dalla ISI (5 anni invece di 2 per le citazioni ricevute), perchè tiene conto che alcune discipline ricevono citazioni più tardi rispetto a altre

whyeigenfig4.jpg

Immagini tratte dal sito (cliccare per ingrandire)

E’ utile alle biblioteche perchè fornisce informazioni sull’effettivo costo di un articolo tramite Journal Prices http://www.journalprices.com/

Attualmente comprende più di 7000 giornali scientifici e oltre 110mila items comprese tesi e popular magazines

Sui metodi di ranking usati vedi http://www.eigenfactor.org/methods.htm

Gli indicatori usati sono Article Influence (AI): a measure of a journal’s prestige based on per article citations and comparable to Impact Factor.
Eigenfactor (EF): A measure of the overall value provided by all of the articles published in a given journal in a year

Post correlati: Calcolare l’Impact factor

Per approfondire: Rossana Moriello, “L’indice di Hirsch (h-index) e altri indici citazionali dopo l’impact factor”, Biblioteche Oggi, 25 (1), pp.23-31 (disponibile in biblioteca)

“Eigenfactor.” American Library Association. 2007.
http://www.ala.org/ala/acrl/acrlpubs/crlnews/backissues2007/may07/Eigenfactor.htm (Accessed 27 Jun, 2007)

[Via: LibLicense]

Riportiamo la mail apparsa in LibLicense

Eigenfactor http://www.eigenfactor.org ranks journals much as Google ranks websites. Scholarly references join journals together in a vast network of citations. Eigenfactor uses the structure of the entire network
to evaluate the importance of each journal.
The website provides influence rankings for 7000+ science and
social science journals and rankings for an additional 110,000+
reference items including newspapers, and popular magazines.
“Borrowing methods from network theory, eigenfactor.org ranks the
influence of journals much as Google’s PageRank algorithm ranks
the influence of web pages [2]. By this approach, journals are
considered to be influential if they are cited often by other
influential journals. Iterative ranking schemes of this type,
known as eigenvector centrality methods [3], are notoriously
sensitive to “dangling nodes” and “dangling clusters”: nodes or
groups of nodes which link seldom if at all to other parts of the
network. Eigenfactor modifies the basic eigenvector centrality
algorithm to overcome these problems and to better handle certain
peculiarities of journal citation data.”
“Different disciplines have different standards for citation and
different time scales on which citations occur. The average
article in a leading cell biology journal might receive 10-30
citations within two years; the average article in leading
mathematics journal would do very well to receive 2 citations
over the same period. By using the whole citation network,
Eigenfactor automatically accounts for these differences and
allows better comparison across research areas.”
“Eigenfactor.org is a non-commercial academic research project
sponsored by the Bergstrom lab in the Department of Biology at
the University of Washington. We aim to develop novel methods for
evaluating the influence of scholarly periodicals and for mapping
the structure of academic research. We are committed to sharing
our findings with interested members of the public, including
librarians, journal editors, publishers, and authors of scholarly
articles.”
The Eigenfactor Web site http://www.eigenfactor.org is still
under development.

3 Risposte

  1. Segnalo:

    Automatic and versatile publications ranking for research institutions and scholars
    in “Communications of the ACM”
    Volume 50 , Issue 6 (June 2007)
    Pages: 81 – 85

    http://portal.acm.org/citation.cfm?id=1247001.1247010

  2. Woah! I’m really loving the template/theme of this blog. It’s simple,
    yet effective. A lot of times it’s very hard to get that “perfect balance” between user friendliness and visual appearance. I must say you have done a fantastic job with this. In addition, the blog loads extremely fast for me on Chrome. Superb Blog!

Lascia un commento

Inserisci i tuoi dati qui sotto o clicca su un'icona per effettuare l'accesso:

Logo WordPress.com

Stai commentando usando il tuo account WordPress.com. Chiudi sessione / Modifica )

Foto Twitter

Stai commentando usando il tuo account Twitter. Chiudi sessione / Modifica )

Foto di Facebook

Stai commentando usando il tuo account Facebook. Chiudi sessione / Modifica )

Google+ photo

Stai commentando usando il tuo account Google+. Chiudi sessione / Modifica )

Connessione a %s...

%d blogger cliccano Mi Piace per questo: