-------- Original Message --------
Subject: Re: scaling eigenvectors according to 1/SQRT of eigenvalues
Date: Thu, 15 Mar 2012 19:12:53 -0400
From: F. James Rohlf <[email protected]>
Reply-To: [email protected]
To: Morphmet <[email protected]>
No, that is if you multiply by sqrt lambda. The question was about
division.
-------
Sent remotely by F. James Rohlf,
John S. Toll Professor, Stony Brook University
-----Original Message-----
From: morphmet <[email protected]>
Date: Thu, 15 Mar 2012 23:39:14
To: morphmet<[email protected]>
Reply-To: [email protected]
Subject: Re: scaling eigenvectors according to 1/SQRT of eigenvalues
-------- Original Message --------
Subject: Re: scaling eigenvectors according to 1/SQRT of eigenvalues
Date: Thu, 15 Mar 2012 16:14:19 -0400
From: Robert Corruccini <[email protected]>
To: [email protected]
Traditionally that transform is supposed to give the product moment
correlation between the variables and the PC axis ....
On Thu, Mar 15, 2012 at 3:09 AM, morphmet
<[email protected]
<mailto:[email protected]>> wrote:
-------- Original Message --------
Subject: RE: scaling eigenvectors according to 1/SQRT of eigenvalues
Date: Wed, 14 Mar 2012 18:23:48 -0400
From: F. James Rohlf <[email protected]
<mailto:[email protected]>>
Reply-To: <[email protected]
<mailto:[email protected]>>
Organization: Stony Brook University
To: <[email protected] <mailto:[email protected]>>
That simply gives you the scaled eigenvectors of the inverse of the
covariance matrix.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
F. James Rohlf, John S. Toll Professor, Stony Brook University
The much revised 4th editions of Biometry and Statistical Tables
are now
available:
http://www.whfreeman.com/__Catalog/product/biometry-__fourthedition-sokal
<http://www.whfreeman.com/Catalog/product/biometry-fourthedition-sokal>
http://www.whfreeman.com/__Catalog/product/__statisticaltables-__fourthedition-roh
<http://www.whfreeman.com/Catalog/product/statisticaltables-fourthedition-roh>
lf
-----Original Message-----
From: morphmet [mailto:morphmet_moderator@__morphometrics.org
<mailto:[email protected]>]
Sent: Tuesday, March 13, 2012 9:11 AM
To: morphmet
Subject: scaling eigenvectors according to 1/SQRT of eigenvalues
-------- Original Message --------
Subject: scaling eigenvectors according to 1/SQRT of eigenvalues
Date: Tue, 13 Mar 2012 12:01:45 -0400
From: andrea cardini <[email protected]
<mailto:[email protected]>>
To: [email protected] <mailto:[email protected]>
Dear morphometricians,
please, has anyone got any experience of PCAs where
eigenvectors are
scaled according to 1/SQRT of eigenvalues? What's the aim and
typical use?
Any introductory reference?
Thanks in advance for your help.
Cheers
Andrea
Dr. Andrea Cardini
Researcher in Animal Biology
Dipartimento di Biologia, Universitá di Modena e Reggio Emilia,
via Campi
213,
41100, Modena, Italy
tel: 0039 059 2055017 ; fax: 0039 059 2055548
Honorary Fellow
Functional Morphology and Evolution Unit, Hull York Medical School
University of Hull, Cottingham Road, Hull, HU6 7RX, UK
University of York,
Heslington, York YO10 5DD, UK
Adjunct Associate Professor
Centre for Forensic Science , The University of Western Australia
35 Stirling Highway, Crawley WA 6009, Australia
E-mail address: [email protected]
<mailto:[email protected]>, [email protected]
<mailto:[email protected]>,
[email protected] <mailto:[email protected]>,
[email protected] <mailto:[email protected]>
Webpage: http://sites.google.com/site/__hymsfme/drandreacardini
<http://sites.google.com/site/hymsfme/drandreacardini>
Datasets:
http://ads.ahds.ac.uk/__catalogue/archive/cerco_lt___2007/overview.cfm#meta
<http://ads.ahds.ac.uk/catalogue/archive/cerco_lt_2007/overview.cfm#meta>
data
Editorial board for:
Zoomorphology:
http://www.springer.com/life+__sciences/animal+sciences/__journal/435
<http://www.springer.com/life+sciences/animal+sciences/journal/435>
Journal of Zoological Systematics and Evolutionary
Research:
http://www.wiley.com/bw/__journal.asp?ref=0947-5745&__site=1
<http://www.wiley.com/bw/journal.asp?ref=0947-5745&site=1>
Hystrix, the Italian Journal of Mammalogy:
http://www.italian-journal-of-__mammalogy.it/
<http://www.italian-journal-of-mammalogy.it/>
--
Robert S. Corruccini
Professor Emeritus and Distinguished Scholar
Department of Anthropology
Southern Illinois University
Carbondale, IL 62901-4502
