Procrustes superimposition only removes isometric size variation. Shape changes
that are a function of size (allometry) are not removed so a regression of some
sort is needed.
F. James Rohlf, Distinguished Professor, Emeritus. Ecology & Evolution
Rese
Hi Alex,
I'm assuming that your shape data are landmark configurations that
have been subjected to a Procrustes superimposition. is that correct?
If so, I dont think the regression you described is really necessary-
Procrustes analysis will remove the effects of size, orientation, and
position.
W
Phylogenetic PCA has many unusual properties, and does not remove the effects
of phylogeny. Yes, it is the case that the variance of the scores on the first
phylogenetic principal component can be higher than the second PC. We recently
had a paper in the Hystrix morphometrics volumes about the
