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.
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:
>> 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
>> 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.
>> Dr. Dean C. Adams
>> Department of Ecology, Evolution, and Organismal Biology
>> Department of Statistics
>> Iowa State University
>> 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.
>> MORPHMET may be accessed via its webpage at http://www.morphometrics.org
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