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/<http://www.public.iastate.edu/~dcadams/> phone: 515-294-3834 From: Andrey Lissovsky [mailto:andlis...@gmail.com] Sent: Tuesday, October 31, 2017 9:26 AM To: MORPHMET <firstname.lastname@example.org> Cc: andlis...@gmail.com; volk...@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+unsubscr...@morphometrics.org<mailto: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.