Comparison of SCImago journal rank indicator with journal impact factor

Wed Apr 23 14:35:30 EDT 2008

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 
 <mailto:loet at leydesdorff.net> loet at leydesdorff.net ;
<http://www.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

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  <mailto:loet at LEYDESDORFF.NET> 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

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:

For the top 20 on the SJR, the correlations are as follows:

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 
 <mailto:loet at leydesdorff.net> loet at leydesdorff.net ;
<http://www.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

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>
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
<http://directorioexit.info/consulta.php?directorio=exit&campo=ID&texto=478>
&campo=ID&texto=478
http://redec-mes.blogspot.com/

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