SIGMETRICS Digest - 16 Mar 2005 to 17 Mar 2005 (#2005-40)

Fri Mar 18 00:10:08 EST 2005

We could have a WISe meeting if you were there, since Marek is also coming.

Yanchun

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Subject: SIGMETRICS Digest - 16 Mar 2005 to 17 Mar 2005 (#2005-40)

There are 2 messages totalling 211 lines in this issue.

Topics of the day:

  1. the disciplinary classification of scientific journals -- preprint
version
  2. Larry Summers about women in science and citation analysis

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Date:    Thu, 17 Mar 2005 08:19:47 +0100
From:    Loet Leydesdorff <loet at LEYDESDORFF.NET>
Subject: the disciplinary classification of scientific journals -- preprint
version

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Can Scientific Journals be  <http://www.leydesdorff.net/classif03>
Classified in terms of Aggregated Journal-Journal Citation Relations = using
the Journal Citation Reports?=20

 Journal of the American Society for Information Science and Technology
(forthcoming)

 <http://www.leydesdorff.net/classif03/classif03.pdf> <pdf-version>

=20

The aggregated citation relations among journals included in the Science
Citation Index provide us with a huge matrix which can be analyzed in
various ways. Using principal component analysis or factor analysis, the
factor scores can be used as indicators of the position of the cited
journals in the citing dimensions of the database. Unrotated factor = scores
are exact, and the extraction of principal components can be made = stepwise
since the principal components are independent. Rotation may be needed = for
the designation, but in the rotated solution a model is assumed. This
assumption can be legitimated on pragmatic or theoretical grounds. Since =
the resulting outcomes remain sensitive to the assumptions in the model, an
unambiguous classification is no longer possible in this case. However, =
the factor-analytic solutions allow us to test classifications against the
structures contained in the database. This will be demonstrated for the
delineation of a set of biochemistry journals.

=20

** apologies for cross-postings

=20
  _____ =20

Loet Leydesdorff
Universit=E9 de Lausanne, School of Economics (HEC);=20 Amsterdam School of
Communications Research (ASCor) =20

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1400"
name=3DGENERATOR></HEAD> <BODY> <DIV><FONT face=3DArial size=3D2> <P
class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><B><FONT = face=3D"Times New
Roman"=20 size=3D3><A href=3D"http://www.leydesdorff.net/classif03">Can
Scientific = Journals be=20 Classified in terms of Aggregated
Journal-Journal Citation Relations = using the=20 <I>Journal Citation
Reports</I>? </A></FONT></B></P> <P class=3DMsoNormal style=3D"MARGIN: 0in
0in 0pt"><FONT=20 face=3D"Times New Roman"><FONT
size=3D3><B> </B><I>Journal of the = American=20 Society <SPAN
class=3D031310607-17032005>for</SPAN> Information = Science and=20
Technology </I>(forthcoming)</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt">
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT face=3D"Times = New
Roman"=20 size=3D3></FONT></P><FONT face=3D"Times New Roman"
size=3D3></FONT></P> <P class=3DMsoNormal style=3D"MARGIN: 0in 0in
0pt"><A=20 href=3D"http://www.leydesdorff.net/classif03/classif03.pdf"><FONT
= size=3D3><FONT=20 face=3D"Times New Roman"><SPAN=20
style=3D"COLOR: windowtext; TEXT-DECORATION: none; text-underline: =
none"><IMG=20 height=3D39 src=3D"cid:031310607 at 17032005-0AEE" width=3D42
border=3D0=20
v:shapes=3D"_x0000_i1025"></SPAN><pdf-version></FONT></FONT></A></P=
>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT face=3D"Times = New
Roman"=20 size=3D3></FONT> </P> <P class=3DMsoNormal style=3D"MARGIN:
0in 0in 0pt"><FONT face=3D"Times = New Roman"=20 size=3D3>The aggregated
citation relations among journals included in = the=20 <I>Science Citation
Index</I> provide us with a huge matrix which can be =

analyzed in various ways. Using principal component analysis or factor =
analysis,=20 the factor scores can be used as indicators of the position of
the = <I>cited</I>=20 journals in the <I>citing</I> dimensions of the
database. Unrotated = factor=20 scores are exact, and the extraction of
principal components can be made =

stepwise since the principal components are independent. Rotation may be =
needed=20 for the designation, but in the rotated solution a model is
assumed. = This=20 assumption can be legitimated on pragmatic or theoretical
grounds. Since = the=20 resulting outcomes remain sensitive to the
assumptions in the model, an=20 unambiguous classification is no longer
possible in this case. However, = the=20 factor-analytic solutions allow us
to test classifications against the=20 structures contained in the database.
This will be demonstrated for the=20 delineation of a set of biochemistry
journals.</FONT></P> <P class=3DMsoNormal style=3D"MARGIN: 0in 0in
0pt"><FONT face=3D"Times = New Roman"=20 size=3D3></FONT> </P> <P
class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
class=3D031310607-17032005><FONT face=3D"Times New Roman" size=3D3>** =
apologies for=20 cross-postings</FONT></SPAN></P></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV><FONT size=3D2> <DIV
align=3Dleft> <HR> </DIV></FONT> <DIV align=3Dleft><FONT size=3D2>Loet
Leydesdorff<BR>Universit=E9 de = Lausanne, School=20 of Economics (HEC);
</FONT></DIV> <DIV align=3Dleft><FONT size=3D2>Amsterdam School of
Communications = Research=20 (ASCor)</FONT></DIV>
<DIV> </DIV></BODY></HTML>

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Date:    Thu, 17 Mar 2005 16:06:12 -0500
From:    Eugene Garfield <garfield at CODEX.CIS.UPENN.EDU>
Subject: Larry Summers about women in science and citation analysis

The following article contains an interest reference to citation analysis.

For those of you out side the USA who are not familiar with the controversy
at Harvard University, as reported in the NY Times today the faculty of
Harvard voted "no confidence" in  President Larry Summers. This vote is not
binding on the Board of Governors and he will continue in his post.

http://www.michnews.com/artman/publish/article_6985.shtml

HARVARD'S LARRY SUMMERS IS PRO-WOMEN AND PRO-SCIENCE
By Michael J. Gaynor
MichNews.com
Feb 23, 2005

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End of SIGMETRICS Digest - 16 Mar 2005 to 17 Mar 2005 (#2005-40)
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