Comparison of SCImago journal rank indicator with journal impact factor

Wed Apr 23 23:50:56 EDT 2008

Hi Loet,

with respect to your previous email, we performed a PCA on about 50  
metrics (so far excluding the h-index and SJR) for the MESUR project  
(<http://www.mesur.org/>). It may be of interest to the readers of  
this list (see attached graphic) and is discussed in this paper:

Bollen, J., Van de Sompel, H. and Rodriguez, M. A. Towards Usage- 
based Impact Metrics: First Results from the MESUR Project. In  
Proceedings of the Joint Conference on Digital Libraries, Pittsburgh,  
PA, June 16–20, 2008. <http://arxiv.org/abs/0804.3791>

The metrics in the graph carry code names that can be resolved here:
<http://www.mesur.org/Metrics.html>

Regards,

Johan.

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----
Johan Bollen
Los Alamos National Laboratory (P362-proto)
Los Alamos, NM 87545
Ph: 505 606 0030, Fx: 505 665 6452
jbollen at lanl.gov, http://public.lanl.gov/jbollen
----

On Apr 23, 2008, at 12:35 PM, Loet Leydesdorff wrote:

> Adminstrative info for SIGMETRICS (for example unsubscribe): http:// 
> web.utk.edu/~gwhitney/sigmetrics.html
> <250052918>
>
> Factor 1 explains > 59% of the variation and are size-dependent  
> indicators: nr. of publications (or issues in JCR terminology),  
> total cites , total documents and the number of self-citations.
>
> Factor 2 explains appr. 25% of the variation and can be considered  
> as indicators of the type of a ratio of citations over publications.
>
> The H-index has factor loadings > 0.6 on both. This explains its  
> popularity: it provides us with a single indicator to measure both  
> (analytically very different) dimensions using a single number.  
> Politicians and managers love simple rankings and single numbers. :-)
>
> Best wishes,
>
> Loet
>
> Loet Leydesdorff
> Amsterdam School of Communications Research (ASCoR),
> Kloveniersburgwal 48, 1012 CX Amsterdam.
> Tel.: +31-20- 525 6598; fax: +31-20- 525 3681
> loet at leydesdorff.net ; http://www.leydesdorff.net/
>
>
> From: ASIS&T Special Interest Group on Metrics  
> [mailto:SIGMETRICS at LISTSERV.UTK.EDU] On Behalf Of Lic. Ricardo  
> Arencibia Jorge
> Sent: Tuesday, April 22, 2008 3:37 PM
> To: SIGMETRICS at LISTSERV.UTK.EDU
> Subject: Re: [SIGMETRICS] Comparison of SCImago journal rank  
> indicator with journal impact factor
>
> Adminstrative info for SIGMETRICS (for example unsubscribe): http:// 
> web.utk.edu/~gwhitney/sigmetrics.html
> Dear Loet,
>
> yes, its very interesting, because the influence weight change the  
> point of view (I remember now the work of Pinsky & Narin (1976), or  
> recent projects like "eigenfactor.org", etc. In this sense, the  
> SCImago Journal and Country Rank will exceed the expectations. The  
> aim of this project is ambitious, and the probability of this  
> project to achieve great results in the field of science  
> assessments is high.
>
> I think the correlation IF - SJR  will be significant if we take  
> into acount all the journals comprised in the SCImago Journal Rank  
> (We had been developing some experimental studies in specific  
> fields, and the correlation is alwais significant, for the  
> moment ;-). Thats the reason because Dr. Falagas did not emphasize  
> that point in our article.
>
> However, the analysis of the first 20 journals (as you noted) is an  
> incentive in order to develop more deep studies of the indicators  
> presented by the SCImago Research Group.
>
> Friendly Regards,
>
> Ricardo
> ----- Original Message -----
> From: Loet Leydesdorff
> To: SIGMETRICS at LISTSERV.UTK.EDU
> Sent: Monday, April 21, 2008 11:52 AM
> Subject: Re: [SIGMETRICS] Comparison of SCImago journal rank  
> indicator with journal impact factor
>
> Adminstrative info for SIGMETRICS (for example unsubscribe): http:// 
> web.utk.edu/~gwhitney/sigmetrics.html
> Dear Ricardo,
>
> I could not resist looking at your table 2 to compute the rank- 
> order correlations between the IF and the SJR.
>
> For the top 20 in the SCI, the correlations are as follows:
>
> <250052918>
> For the top 20 on the SJR, the correlations are as follows:
>
> <250052918>
> The correlations are not significant.
> Interesting, isn't it?
>
> Best wishes, Loet
> Loet Leydesdorff
> Amsterdam School of Communications Research (ASCoR),
> Kloveniersburgwal 48, 1012 CX Amsterdam.
> Tel.: +31-20- 525 6598; fax: +31-20- 525 3681
> loet at leydesdorff.net ; http://www.leydesdorff.net/
>
>
> From: ASIS&T Special Interest Group on Metrics  
> [mailto:SIGMETRICS at listserv.utk.edu] On Behalf Of Lic. Ricardo  
> Arencibia Jorge
> Sent: Saturday, April 19, 2008 8:53 PM
> To: SIGMETRICS at listserv.utk.edu
> Subject: [SIGMETRICS] Comparison of SCImago journal rank indicator  
> with journal impact factor
>
> Adminstrative info for SIGMETRICS (for example unsubscribe): http:// 
> web.utk.edu/~gwhitney/sigmetrics.html
> Dear Colleagues,
>
> I am sending the link of a paper developed by Matthew E. Falagas  
> and his team from the Alpha Institute of Biomedical Sciences  
> (Athens, Greece), and with the collaboration of Henry Dunant  
> Hospital (Athens, Greece) and the Network of Scientometrics Studies  
> for Higher Education (Havana, Cuba). Its a brief comparison of  
> Journal Citation Report and SCImago Journal & Country Rank, and  
> between the most important indicators both presented: the Impact  
> Factor and the SCImago Journal Rank. These results are only the  
> beginning of several works that I am sure will be developed in the  
> near future in order to statistically compare both indicators.
>
> Falagas ME, Kouranos VD, Arencibia R, Karageorgopoulos DE.  
> Comparison of SCImago journal rank indicator with journal impact  
> factor. FASEB Journal 2008, Apr 11. http://www.fasebj.org/cgi/ 
> content/abstract/fj.08-107938v1
>
> Best regards,
>
> BSc. Ricardo Arencibia-Jorge
> Network of Scientometric Studies for Higher Education
> National Scientific Research Center, Havana, Cuba.
> ricardo.arencibia at cnic.edu.cu
> http://directorioexit.info/consulta.php? 
> directorio=exit&campo=ID&texto=478
> http://redec-mes.blogspot.com/