Hi everyone, In a very disparate sample of bird skulls I am using a configuration with both lnmdks and smlndmks. Specifically, to capture the lateral morphology of the beak (likely the most variable area) I digitized 2 curves with 15 evenly-spaced semilandmarks.
The 2 curves are constrained by 3 regular lndmks forming a triangle, the tip-of-the-beak landmark (landmark 1) is the anterior end of both curves. When I slide the smlndmks in tpsRelw with min-dsquare slide method some of the anterior smlndmks collapse in a very narrow section in both of the 2 curves in the Procrustes superimposition. This effect is not affecting to the other curve in the configuration (midline of the neurocranium) that is apparently much less variable in my sample. Also, minimum bending energy slide method does not affect the superimposition in this way, but I want to try to use min-dsquare. I have tried to change the slide maximum iterations and slide recursive options but still recover the same effect. Any idea what is going on here? Is it a bug of the program or is it a proper statistical effect? Thank you! Guillermo Navalón -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
