Re: [MORPHMET] Question about MorphoJ/Landmarking

2019-03-27 Thread Amanda Hale 
Hi Sara,

In the Preliminaries menu in MorphoJ there is the option to Select Landmarks 
where you can include/exclude any landmarks in your total set. This will create 
a new dataset with only the landmarks you want.

As for informative landmarks, that depends on the structure under study as well 
as sample size. I recommend picking up many of Dr. Klingenberg’s references, 
the Zelditch text (green book) and many, many more to asses the validity of 
landmark dimensionality to sample size and shape characterization.

Best,
Amanda

Amanda R. Hale, M.A., C-FASE II

> On Mar 25, 2019, at 8:41 AM, Sara Schoen  wrote:
> 
> Hello!
> 
> I'm working on the beginnings of a masters thesis and part of it is taking 
> over a project from a previous student. I am learning MorphoJ to help finish 
> that project, but the original student used 14 landmarks (LMs) and we've 
> realized some of those are not helpful in our anaylsis. They act as noise and 
> I've been asked to exclude those points. 
> 
> Is there a way for me to exclude those LMs (as in only consider 1-9 and 
> ignore 10-14) in MorphoJ or would it be better to just start over? 
> 
> If I start over, is there a certain number of LMs I *need* to have? Is there 
> a minimum? How will this change the results if I don't have a lot? The "New" 
> method would include 9 LMs. 
> 
> Thank you to any help/advice you can give me!
> 
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RE: [MORPHMET] Question about MorphoJ/Landmarking

2019-03-27 Thread Murat Maga 
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A good place for you to start is the MorphoJ manual. Specifically the Preli=
minaries section
http://www.flywings.org.uk/MorphoJ_guide/frameset.htm?index.htm

As for how the selection of landmarks will affect the results, short answer=
 is it depends. We use landmarks to model a complex shape in a simple and r=
eproducible way. If your end goal is somehow dependent on having an accurat=
e estimate of variation (e.g