Hello, I'm not an expert in geometric morphometrics, so if I am wrong, I hope someone correct me.
The splines always show the difference in shape between a reference and a target. You can choose the consensus of two populations and see the difference between them, or the difference between the consensus of one population and some specimen in particular or the difference between two specimens...Depends on what you want. Use the tpsrewl program to compute the relative warp, and display them. One of the options in the RW ordination plot, let you visualize the spline for the choose relative warp. You have only to click on the button with the camera, and another window appear with the spline. There are a red circle in the center of the coordenates edge, and moving it, you can have the spline you want. I think that I am not able to explain you what you inquire about uniform components, sorry! I only know that the uniform component represents the differences in shape described by movements of the grid that conserve parallel the grid lines.I've read something about it represent more general trends of shape variation...but I'm not sure. <>< <>< <>< <>< <>< <>< <>< <>< Dolores Garabana Barro Institute of Fisheries Research Eduardo Cabello, 6 36208 Vigo (Spain) e-mail: [EMAIL PROTECTED] ><> ><> ><> <>< ><> ><> ><> ><> ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, June 21, 2004 7:39 PM Subject: RWA > Dear Morphometrists > I am a bigginer in Geometric Morphometrics and I would be really > appreciate it if you could help me on my problem. > 1) How could we calculate the Splines for tow favorite relative warp and > for mean of each population? In softwares sucj "tpsSplin" and "PAST", I > can obtain the deformation grid for each specimen (not each population) > and for each partial warp or the complete warp. But in papers I have > seen that the scatter plot of 2 relative warps (for example Rw1 and RW2) > is given asoociated with the splines for these two relative warps. How > could we estimate these splines (I mean the mean spline for tow favorite > RWs not for each one seperately). > 2) What's the use and interpretation of Uniform components? I know it > shows the unlocalizable transformations, but how we could interpret it. > I was done a Cononical discriminant function analysis on 2 uniform > components but it shows really different results than CDF analysis of > aligned specimens matrix. Some groups it shows 0% correctly > classification and they calssify 100% with another groups, however CDF > analysis on aligned specimens shows really different results. > Many thanks in advance for any help > Sincerely yours > Roohollah siahsarvie > Facuylty of sciences > Ferdowsi University > 91735 > Mashad > IRAN > [EMAIL PROTECTED] > ------------------------------------------ > > Faites un voeu et puis Voila ! www.voila.fr > > == > Replies will be sent to list. > For more information see http://life.bio.sunysb.edu/morph/morphmet.html. > > == Replies will be sent to list. For more information see http://life.bio.sunysb.edu/morph/morphmet.html.
