----- Forwarded message from Eugenia Gold
<eg...@amnh.org> -----
Date: Fri, 17 Jan 2014 16:54:40
-0500
From: Eugenia Gold <eg...@amnh.org>
Reply-To:
Eugenia Gold <eg...@amnh.org>
Subject: RE: PCA in R vs RWA in
tpsRelW
To: "morphmet@morphometrics.org"
<morphmet@morphometrics.org>
Hello everyone (again),
After trying some things, I still end up with a different result in R and
in TPS when I try to run a PCA/RWA on sliding semilandmarks. The dataset is
identical for both. I have tried aligning with both bending energy and with
procrustes in both programs.
I ran a Mantel test in PAST, as per a suggestion I received from my earlier
message, and got an R of 0.9784 and p=0.5. I was wondering if anyone has
encountered this on their own data and if you have any other potential
explanations for the cause of the difference?
Thanks for any and all help! I greatly appreciate it.
-Eugenia
Doctoral Candidate
Richard Gilder Graduate School
American Museum of Natural History
New York, NY 10024
From: morphmet_modera...@morphometrics.org
[morphmet_modera...@morphometrics.org]
Sent: Tuesday, January 14, 2014 5:22 PM
To: morphmet@morphometrics.org
Subject: PCA in R vs RWA in tpsRelW
Sent: Tuesday, January 14, 2014 5:22 PM
To: morphmet@morphometrics.org
Subject: PCA in R vs RWA in tpsRelW
----- Forwarded message from Eugenia Gold <eg...@amnh.org> -----
Date: Tue, 14 Jan 2014 16:12:12 -0500
From: Eugenia Gold <eg...@amnh.org>
Reply-To: Eugenia Gold <eg...@amnh.org>
Subject: PCA in R vs RWA in tpsRelW
To: "morphmet@morphometrics.org" <morphmet@morphometrics.org>
Hi everyone!
I'm working on a project in which I use sliding semilandmarks. I've run the
dataset through the tpsRelW software and through R using the geomorph package,
but I get different results using each. I've fixed the slider file to allow for
sliding semilandmarks
in geomorph. My understanding is the RWA is equivalent to PCA, so would there
be a difference in a PC1vPC2 versus a RW1vRw2 plot?
Thanks for the help!
-Eugenia
M. Eugenia L. Gold
Doctoral Candidate
Richard Gilder Graduate School
Division of Paleontology
American Museum of Natural History
New York, NY 10024
----- End forwarded message -----
----- End forwarded message
-----
