Those distances are not that difficult to compute. Simply read the tps file into tpsSmall, click the 'compute' button, and then go the File|Save menu and you will see that saving a matrix of Procrustes distances is one of the choices.
---------------------------------------------- F. James Rohlf, Distinguished Professor & Grad. Prog. Dir. Dept. Ecology & Evolution, Stony Brook University Stony Brook, NY 11794-5245
-----Original Message----- From: morphmet [mailto:[EMAIL PROTECTED] Sent: Friday, February 17, 2006 2:01 PM To: [email protected] Subject: Procrustes Distance between individuals Hello everybody, I'm working with a group of fish called hamlets and I have a total sample size of 226 individuals. I have used 14 landmarks, Procrustes superimposition and various statistical techniques to compare 6 groups, which these fish are divided into (based on sampling location and morphotype). One useful indicator of morphological similarity between groups is Procrustes distance. One thing which I am interested in doing is obtaining a data set of the morphological distances between individuals. However, as this equates to 1000's of separate comparisons, I have calculated that if I were to start aligning each pair of individuals, and find the procrustes distance between them, then I wouldn't finish working until somewhere near 2007. I doubt it would be worth the effort to be honest. This leaves me with 3 alternatives as I see it: 1. I can use a spreadsheet and the co-ordinates of all the aligned landmarks to obtain the distance between pairs of individuals. This would be quite easy to do but, as the pairs are not aligned with each other (but with the entire dataset), the distances are not Procrustes distances. 2. I could alternatively just analyse a small subsample, with individuals taken from each group. 3. Or I could just give the whole thing up as a bad idea. I've not found an example of somebody else using this kind of data, maybe there is a reason why it shouldn't be done. I am new to morphometrics and if anybody has any ideas on this I would be very grateful for your help. If you wish to reply to me personally then my email address is: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>. Cheers, Ben Holt, University of East Anglia -- 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
