Louise, You could use discriminant function analysis on the aligned structures and see how well the Top k of n PCs correctly putting individuals into 'correct' categories.
Joe On Nov 8, 2007, at 7:16 AM, morphmet wrote: > Dear morphometricians, > > I have the following problem: > > I have performed a PCA of shape (relative warps analysis) on a set of > mouse mandibles from animals of different geographic origins. Now in a > plot of PC1 vs PC2, I can "see" that PC1 sorts specimens into broadly > overlapping clusters corresponding to the respective origins of the > mice, while PC2 (and the other PCs) do not. The problem is now that > the > overlaps of the "population" clusters are rather broad so the question > is how different they actually are. Also, I have several > "populations", > so it looks like a continuum of overlapping clouds. > Could you recommend a means to quantify and/or somehow test the actual > differences between "populations" along PC1? > > Louis Boell > > ---------------------------------------------------------------------- > -- > Machen Sie Ihre E-Mail-Kontakte zu Messenger-Freunden! Einfacher > Adressimport! > <http://redirect.gimas.net/?cat=hmtl&n=M1007AI&d=http:// > messenger.live.de/ersteschritte_adressimport.html> > > -- > Replies will be sent to the list. > For more information visit http://www.morphometrics.org ----------------------------------------- Joseph G. Kunkel, Professor Biology Department University of Massachusetts Amherst Amherst MA 01003 http://www.bio.umass.edu/biology/kunkel/ -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
