Factor d’impacte, índex de reputació


Gràcies a The Scientst he vist un article de Wired titulat The Genius Index: One Scientist’s Crusade to Rewrite Reputation Rules que parla de factors d’impacte de revistes científiques i d’índexs de reputació. En aquest article es fa una repassada al naixement del concepte de factor d’impacte d’una revista científica, tot arribant a l’anomenat “índex h” lligat a un investigador. De fet, sembla que el PageRank de Google hi està relacionat.

El que em sembla interessant d’aquest article de Wired és, però, l’extensió d’aquests conceptes a la comunicació a Internet, per exemple el Twitter. I també que tracta noves mètriques, o sigui formes de mesurar l’impacte: número de descàrregues, número de descàrregues per unitat de temps (cronometria), i altres indicadors no bibliomètrics (com el que fem servir per avaluar la recerca, com el número d’estudiants de doctorat).

The depth of data available on the Internet and the increasing importance of online archives and publications like the ArXiv for physics and the Public Library of Science for biomedicine have made possible new metrics: number of downloads, rate of downloads over time (chronometrics), and even levels of funding and numbers of doctoral students working in a lab (nonbibliometric performance indicators). So powerful are these new kinds of measurements that they’re finding applications beyond ranking scientists. One recent article suggested that citation analysis could be used to predict the direction of scientific innovation.

Not even Web flavor-of-the-month Twitter is immune. The microblogging site displays the number of users following a given Twitterer, and the number of users that person follows. So you can see where this is going: Various Web sites track Twitter use, factoring in those numbers as well as “re-tweets,” the number of times a person’s posts get recapitulated, to come up with ranks for users. The more important any given Web application becomes, the more its users want ranks.

Wired parla també del grup Scimago de Granada, que duu a terme bons estudis bibliomètrics de la recerca:

While the problems of the various citation-based ranking schemes might seem (ahem) academic, their strategies are increasingly the coin of the online realm. Understanding and quantifying reputation is the best approach to navigating the tsunami of information on the Internet. That’s why Google founders Larry Page and Sergey Brin cited Eugene Garfield in their academic work on PageRank, the algorithm that powers their company’s search engine. “Articles cited by this article” and “articles that cite this article” are really just outbound and inbound links. Today, citation analysis has come full circle. Eigenfactor and SCImago actually use variations of PageRank to evaluate scientific journals. And the introduction of Google Scholar, a search tool designed specifically for academic research, provided a whole new set of citation data; it can help calculate h-index, as well as a newer ranking system called the g-index that gives more weight to articles with higher citation counts.

Una adequada barreja d’avaluació de la recerca i de l’avaluació de la comunicació a Internet. Seguirà.