Misdirected post 6 of 7. -mod -------- Original Message -------- Subject: egg shape Date: Mon, 11 Feb 2008 08:44:49 -0500 From: morphmet <[EMAIL PROTECTED]> To: morphmet <[EMAIL PROTECTED]>
-------- Original Message -------- Subject: egg shape Date: Fri, 8 Feb 2008 11:44:46 -0800 (PST) From: Fabio Machado <[EMAIL PROTECTED]> To: [email protected] Dear all, I'm working on egg shape difference in birds and I recently I tried different analyzes, namely Extended Eigenshape Analysis (EEA) for open curves and Thin-plate-spline (TPS) using sliding semilandmarks for the GPA. Initially I though that as EEA is a contour-based analysis, it would be a better approach, but it end up giving really contra-intuitive results. The main goal of the analysis is egg asymmetry and EEA wasn't reflecting it properly. It was restricted to the 3rd Eigenshape and reflected only 0.5% of the variance. I than performed a TPS analysis on the same dataset, and the results were different. This time asymmetry was the second Relative Warp and reflected almost 25% of the variance. The other Eigenshapes and Relative Warps all reflected similar shape differences but with different shape partitions. My mains doubts are: Is this possible, or I am doing some of the analyzes wrong? If not, is there any particular reason why the results differ? I can give more details to anyone in private, if necessary. cheers, -- Fábio de Andrade Machado [EMAIL PROTECTED] Laboratório de Herpetologia Museu de Zoologia da USP Av. Nazaré, 481, Ipiranga São Paulo, SP, 04263-000 +55 11 61658120 +55 11 82631029 -- Replies will be sent to the list. For more information visit http://www.morphometrics.org -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
