Hi Noreen, Semi-landmarks techniques would be the better approach here, as some of the other replies have pointed out.
Another thing I should add is you can use a program called Resample (http://nycep.org/nmg/programs.html) to resample your curves into a user-prescribed set of evenly-spaced semi-landmarks, using weighted linear interpolation. I think you were using the "auto-plot" option (at 4.0 mm) in the microscribe utility software when you were last at the AMNH, and I remembered it was quite buggy. A new version (5.0) has come out since then which fixed the auto-plot option, among other bits. If you (or anyone else) need it, please let me know. For some odd reasons, the updated utility program is not on the microscribe support website. Steve Wang NYCEP Morphometrics Group [EMAIL PROTECTED] -----Original Message----- From: morphmet [mailto:[EMAIL PROTECTED] Sent: Friday, February 02, 2007 11:51 AM To: morphmet Subject: Combining shape variables Dear All I have a question regarding combining two types of morphological variables into the same analysis. I have a 3D landmark configuration and associated 3D outlines, which are registered in a common reference frame (via GPA). I have generated Procrustes variables from the landmark configuration and Fourier coefficients from the outline data. A) Does anyone know of a published example where procrustes variables have been analysed WITH Fourier coefficients in the same analysis (e.g. Principal Components Analysis) and B) If not, can anyone think of any reason why these two types of shape variables cannot be analysed simultaneously? I ran a dummy test using both variables at the same time and found that similar patterns between groups were produced with both variable-types, although cross-validated classification of groups (using Discriminant Function Analysis) was best when both Procrustes and Fourier variables were used together. Any further comments or suggestions would be greatly appreciated! Many thanks in advance Noreen [EMAIL PROTECTED] -- Noreen von Cramon-Taubadel Department of Biological Anthropology University of Cambridge The Henry Wellcome building, Fitzwilliam street Cambridge CB2 1QH Phone: +44 1223 764719 [EMAIL PROTECTED] -- 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
