-------- Original Message --------
Subject: RE: permutations in TPSRegr and asymmetry in pictures
Date: Thu, 26 Apr 2012 22:07:27 -0400
From: F. James Rohlf <ro...@life.bio.sunysb.edu>
Reply-To: ro...@life.bio.sunysb.edu
Organization: Stony Brook University
To: morphmet@morphometrics.org
What the tpsRegr program does is pretty simple. For the 'all option' it
just scrambles the order of the independent variable relative to the
dependent variable across all individual specimens.
For within blocks it simply scrambles the order within each block (it
assume blocks correspond to adjacent specimens in the input files). An
example could be where the blocks corresponded to individuals and a pair
of observations within each block could correspond to its shape before
and after some treatment that could change its shape.
For the among blocks option it scrambles the order of the blocks but
keeps each block intact. This would give a user an idea of how important
the blocks were.
I will have to add more text to the help file! I should add some more
options to make the program more flexible.
Jim
----------------------
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/statisticaltables-fourthedition-rohlf
Please consider the environment before printing this email
-----Original Message-----
From: morphmet [mailto:morphmet_modera...@morphometrics.org]
Sent: Wednesday, April 25, 2012 5:00 PM
To: morphmet
Subject: permutations in TPSRegr and asymmetry in pictures
-------- Original Message --------
Subject: permutations in TPSRegr and asymmetry in pictures
Date: Mon, 23 Apr 2012 07:16:58 -0400
From: andrea cardini <alcard...@gmail.com>
To: morphmet@morphometrics.org
Dear Morphometricians,
please, has anyone got any experience with the different options for
permutation tests in TPSRegr?
I did not manage to find an example in the help file but I may have missed it
and
would really like to find something like the detailed protocol Jim describes for
the test of common slopes etc.
A second unrelated question. I was wondering how studies of asymmetries
might be affected by using pictures of 3D objects (e.g., human faces).
I can easily imagine biases that could spuriously introduce DA in the data and
may not be obvious to detect. Even without any systematic error, I wonder
whether the 2D approximation of a 3D object may affect FA.
Thanks for your help.
Cheers
Andrea
Dr. Andrea Cardini
Dipartimento di Biologia, Universitá di Modena e Reggio Emilia, via Campi 213,
41100, Modena, Italy
tel: 0039 059 2055017 ; fax: 0039 059 2055548
Centre for Anatomical and Human Sciences University of Hull, Cottingham Road,
Hull, HU6 7RX, UK University of York, Heslington, York YO10 5DD, UK
Centre for Forensic Science , The University of Western Australia
35 Stirling Highway, Crawley WA 6009, Australia
E-mail address: alcard...@gmail.com, andrea.card...@unimore.it
Webpage: http://sites.google.com/site/hymsfme/drandreacardini
Editorial board for:
Zoomorphology:
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
Hystrix, the Italian Journal of Mammalogy:
http://www.italian-journal-of-mammalogy.it/
