Dear Ms. Llopis,
It is my understanding that you are correct, Brownian evolution is a
generally considered an assumption in PIC (see Felsenstein, J. 1985.
Phylogenies and the comparative method. American Naturalist 125: 1-15).
Its inclusion is important to Felsenstein's formulation because it
Dear David,
Great question! I disagree with the statement that the samples' variance
in shape space is not biologically real or, perhaps more accurately, is
less real than the variance in any other space. As far as I see it, the
basic strategy in any biostatistical study, be it GM or otherwise,
Dear Dr. Hadi,
I would just like to add one additional comment to your question about the
need for normal distributions in PCA. Dr. Mitteroecker is (of course)
correct that PCA does not make any distributional assumptions, but you
mentioned in passing that confidence ellipses are being placed
Dear Ms. Neves,
Quick addition to Dr. Rohlf's solution. To change a file extension on a
Windows machine, you will need to do the following:
1) Open a Windows Explorer window.
2) On the ribbon at the top of the window, click "View"
3) Click the box for "File Name Extensions" (in the "Show/Hide"
Dear Dr. Hu,
Let me begin by restating how I understand the question: You have completed
a PCA on a morphological data set in which there are two subsets of
interest. Now you would like to decompose the difference between the two
subsets into differences along individual PCs. Here is my two cents
Dear Dr. Rodriguez,
When you said Goodman, did you mean Goodall? If so, these statistics arise
from two different types of tests. Both have their advantages and their
drawbacks.
Goodall's F-test is a shape-specific test for differences between groups,
if I am not mistaken. The advantage is that
Dear Dr. Ibrahim,
As you note, standard LDA does not usually permit nested groupings. In
this scenario, you would either need to have one LDA for sex and one LDA
for ancestry OR you could have one LDA that classifies into compound
sex-ancestry groups (i.e., male-Malay, female-Malay,
Dear Mr. Ardón,
Good question. Whenever we make shape comparisons in GM, be that via
displacement vector or deformation grid (which is what you’re doing), we can
typically only compare two shapes at a time. One shape is called the reference
(or starting shape, in this case). This is the shape
Program
Professor
Department of Ecology, Evolution, and Organismal Biology
Iowa State University
https://www.eeob.iastate.edu/faculty/adams/
phone: 515-294-3834
On Mon, Jun 17, 2019 at 3:53 AM K. James Soda wrote:
> Hello Everyone,
>
> Since Friday afternoon, I have struggl
Hello Everyone,
Since Friday afternoon, I have struggled to put into words the kind of
adviser Dennis Slice was to his students to supplement the elegant
testimonies to his abilities as a researcher, but words fail me. I do not
know how I can properly portray the care and compassion that he
Hello Everyone,
Quick update on the state of morphmet: Over the weekend, I lost some
administrative control over the 2014 version of morphmet. Fearing that this
was an indication that it would go down soon, I started sending out
invitations for a new version. At this point, most members who were
Dear Fellow Morphometricians,
I want to give a quick comment about the future of morphmet after Dennis's
passing so that any necessary changes will not come as a surprise. Please
rest assure that it is not a question of whether morphmet will continue but
rather if any different procedures will be
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