RE: [MORPHMET] Problems with min-dsquare sliding in tpsRelw

2016-08-24 Thread F. James Rohlf
An advantage of the bending energy approach is that it minimizes the chance of 
collapsing landmarks because changes in the positions of landmarks that are 
close together requires much more bending energy. This is not usually a problem 
but it can be if the outline has a sharp corner - which seems likely for a beak.

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-Original Message-
From: Guillermo Navalón [mailto:guiyelm...@gmail.com] 
Sent: Monday, August 22, 2016 9:34 AM
To: MORPHMET 
Subject: [MORPHMET] Problems with min-dsquare sliding in tpsRelw

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

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[MORPHMET] Append tps Curve to Landmarks

2016-08-24 Thread 'MrMupped223' via MORPHMET
Hi,
I have a similar problem like a girl who wrote asked a question on this site  
in 2012. 
I coppied her Email because my written english isn't the best. 
 
"I just started to use the tps suite and I'm having problems with
sliding 2D semilandmarks. I have digitised curves in tpsDig with the curve tool 
and then resampled them to get an equal number of points for each individual."
 
I then removed the control lines 'Ponints=' and 'Curves='.
 
"As I understand it, I then need to turn the points into landmarks (appending) 
and then create a slider file to slide them in tpsUtil. The bit I'm stuck with 
is'appending tps curve to landmarks' in tpsUtil. I enter the file name in 
'input' and chose a file name for 'output', but when I press 'create', I just 
get the error
message:"
 
This is my error massege: 
 
'435.0' is not a valid floating point value Bad decimal character in 
coordinates?.'
 
I get the same error for tps files with and without removed control lines. 
 
I hope someone has an idea why this Problem shows up and can help me.
 
Thanks 
Jan 

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[MORPHMET] Problems with min-dsquare sliding in tpsRelw

2016-08-24 Thread Guillermo Navalón
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

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[MORPHMET] papers on variance difference between sexes

2016-08-24 Thread andrea cardini

Dear All,

I am looking for papers comparing variance in morphometric and other 
phenotypic traits in females and males. I am not talking about mean 
differences as in most tests of sexual dimorphism. I am interested to 
see whether people have found similar variance in a given trait in the 
two sexes or they found that one sex tends to vary more than the other.


Thanks a lot in advance for your suggestions (and pdfs, if available!).

Cheers


Andrea

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e Reggio Emilia, Via Campi, 103 - 41125 Modena - Italy
tel. 0039 059 2058472

Adjunct Associate Professor, School of Anatomy, Physiology and Human Biology, 
The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, 
Australia

E-mail address: alcard...@gmail.com, andrea.card...@unimore.it
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http://www.italian-journal-of-mammalogy.it/public/journals/3/issue_241_complete_100.pdf

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[MORPHMET] Question on combining 3D data from microscribe and CT models

2016-08-24 Thread Pablo Fisichella
Dear morphometricians,

Currently I am performing a study on 3D human craniofacial morphology. I
have data derived from microscribe and from 3D models obtained from CT
scans and procesed in landmark Editor software. My question is if it is
possible to combine both kinds of 3D data within the same form/shape
analysis.  In addition, someone has used/processed 3D data derived from
microscribe  in the package Morpho for R?, is it possible? In the Morpho
User Guide are mentioned only formats derived from the programs for 3D
models (Meshlab, landmark, etc)

Thanks for any suggestion

Best,

Pablo

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