Not, e.g., if all specimens are rotated 90 degrees. Then x coordinates in one set would correspond to the y coordinates in the other. Multivariate R^2 should be close to 1, though.
Philipp Mitteroecker Von meinem iPhone gesendet > Am 31.10.2017 um 16:20 schrieb Andrey Lissovsky <andlis...@gmail.com>: > > Thank you Dean, > > Of course, numbers should differ. But in my case, there is no correlation > between two sets. I guess that in theory the two sets should have r at least > around 0.9? > >> On Tuesday, October 31, 2017 at 5:31:51 PM UTC+3, dcadams wrote: >> Andrey, >> >> >> >> It is unreasonable to expect the numbers will match perfectly between these >> two software packages, as the way in which they perform the operations >> differs. First, MorphoJ uses Full Procrustes fit, whereas the TPS series, >> geomorph, and others use Partial Procrustes fitting. That will make a >> difference. >> >> >> >> Second, there may be additional differences in in how the superimponsed >> specimens, and thus the consensus, is aligned relative to the X-Y coordinate >> system. Some packages allow one to rotate the consensus and aligned >> specimens to their principal axes post-superimposition. That too could lead >> to differences. >> >> >> Dean >> >> >> >> Dr. Dean C. Adams >> >> Professor >> >> Department of Ecology, Evolution, and Organismal Biology >> >> Department of Statistics >> >> Iowa State University >> >> www.public.iastate.edu/~dcadams/ >> >> phone: 515-294-3834 >> >> >> >> From: Andrey Lissovsky [mailto:andl...@gmail.com] >> Sent: Tuesday, October 31, 2017 9:26 AM >> To: MORPHMET <morp...@morphometrics.org> >> Cc: andl...@gmail.com; vol...@yandex.ru >> Subject: Re: [MORPHMET] Procrustes fit >> >> >> >> Thank you, Andrea >> >> I understand that difference should be tiny, so something goes wrong. I >> enclose one of my tps files. Usually I check dots and commas, so the reason >> is probably in some different way.. >> It is possible that I am mixing up menu items.. Last time I use this >> software, the labels were different. >> Now I use: >> In MorphoJ: Preliminaries -- New Procrustes fit -- Align by principle axes >> then: Export dataset -- Procrustes coordinates >> In TPS Relw: Actions -- Consensus >> then: File -- Save -- Aligned specimens >> Is this ok? Should these chains lead to the same results? >> >> On Tuesday, October 31, 2017 at 5:04:56 PM UTC+3, alcardini wrote: >> >> Andrey, the last time I checked this (last July, I believe), differences >> between MorphoJ and TPSRelw were tiny and negligible. I compared MorphoJ >> with R in the last days, and again differences were tiny. >> >> The first thing I'd check is whether there's an issue with commas vs >> dots as decimal separators. >> If you send me the tps file, I can give a quick look. >> >> Cheers >> >> Andrea >> >> -- >> 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 morphmet+u...@morphometrics.org. >> > > -- > 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 morphmet+unsubscr...@morphometrics.org. -- 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 morphmet+unsubscr...@morphometrics.org.
