-------- Original Message --------
Subject: Re:urgent:separating the shape from the size
Date: Tue, 27 May 2008 06:57:36 -0700 (PDT)
From: ali mahmood <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: [email protected]
Dear Thiago
I am very happy to be in contact with you again , in your previous
massage you describe the way to assess the relation between shape and
size by using the regression. I know that the regression is use to
predict some values from the others, so who I can describe the relation
between size and shape by the regression equation?
yours
Ali
--- On *Sun, 5/11/08, morphmet /<[EMAIL PROTECTED]>/*
wrote:
From: morphmet <[EMAIL PROTECTED]>
Subject: Re:urgent:separating the shape from the size
To: "morphmet" <[email protected]>
Date: Sunday, May 11, 2008, 7:37 PM
-------- Original Message --------
Subject: Re:urgent:separating the shape from the size
Date: Sun, 11 May 2008 04:41:19 -0700 (PDT)
From: ali mahmood <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: [email protected]
Dear Thiago
Thank you indeed for your kind information, do you mean that I need to
do the Principal component analysis and then use the engine values as a
determinants for the shape?, my data are 3D do you have any other
suggested software? I am waiting for your helpful answer,thank you
again.
Ali
--- On *Sat, 5/10/08, morphmet
/<[EMAIL PROTECTED]>/*
wrote:
From: morphmet <[EMAIL PROTECTED]>
Subject: Re:urgent:separating the shape from the size
To: "morphmet" <[email protected]>
Date: Saturday, May 10, 2008, 9:37 PM
-------- Original Message --------
Subject: Re:urgent:separating the shape from the size
Date: Sat, 10 May 2008 07:09:37 -0700 (PDT)
From: thimacek <[EMAIL PROTECTED]>
To: morphmet <[email protected]>
Ali,
By using geometric morphometrics, you are already separating
"size"
and
"shape" most, if not all of the time. If you used Landmark
methods
(digitization followed by GPA), you'll have come to a number of
'Partial
Warps' and possibly 'Relative Warps', in addition to the
Centroid
Size.
The centroid size is a measure of size, while the Partial
Warps are the
variables containing the Shape information. It should be noted
that all
Partial Warps should be analyzed together, as each one of them
alone
normally have no biological meaning per se.
The Relative warps are a sort of PCA (principal component
analysis)
done
on the Partial Warps, and as such one may be able to draw
conclusions
by analyzing only the first among them, which represent larger
amounts
of the sample's total variation.
If you want to look for correlation between size and shape - i.e.
allometry - you may make a multivariate regression using
Centroid Size
(the size variable) as the independent variable and the
Partial Warps
(all of them, which together represent shape) as dependent
variables. If
you're making your analysis in 2D, you can do this using the
TPSRegr
program by Rohlf.
I hope this helps!
Thiago
>
>
> -------- Original Message --------
> Subject: urgent:separating the shape from the size
> Date: Sat, 10 May 2008 04:53:11 -0700 (PDT)
> From: ali mahmood
> Reply-To: [EMAIL PROTECTED]
> To: [email protected]
>
>
>
> Dear Friends
>
>
>
> Thank you for your kind help, I send before a question
regarding the
> correlation between the the *size* of face and dental arch in
geometric
> morphometric means ,and I received the answer from some
Friends
as the
> told me that I need to use the *centroid size* for both of
them to
> calculate the correlation for the *size * ,but no one
answer my
question
> regarding the correlation between the *shape *of the face and
dental
> arch (because I would like to separate the* size* from the
*shape, *so
> what I need to calculate for the_ face_ and then to the_
dental
arch_ to
> be used as variables in the correlation for the *shape*?
>
>
>
>
>
> Ali R Al-khatib
>
>
>
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