Dear community,
Many thanks to everyone who responded with your opinions and also
references. I think the set.seed solves the reproducibility problem, and
for practicality, I would just set seed, make a single run at a high
number of replicates such as 10,000, and then report a reasonable upp
Dear Tsung,
The reason the p-value may have decreased as you increased the number of
iterations with your own data set may simply be because you are increasing
the denominator when you calculate the p-value. For example, if you run 5
iterations, the lowest p-value you obtain is 1/5 = 0.2. If you r
We have some money for a photographic equipment and would like to purchase
something that allows for taking good pictures for morphometric work. We have
had offers from Leica but far too expensive.
Do you have any recommendations? YOu know in our labs we always struggle to get
good stuff at good
Tsung,
This property of permutation tests has been known for some time. Generally
speaking, as the number of permutations increases the variation in significance
levels obtained from repeated runs decreases. Earlier work in the statistics
literature from the 70s and 80s by Edgington and others
On 31.5.2015 19:38, Tsung Fei Khang wrote:
Dear community,
I would like to share my experience with using some (really cool)
computational tools for phylogenetic signal and morphological
integration analysis.
I am using physignal (geomorph R package) and the Phylo.Morphol.PLS
function provi
Dear Tsung,
I guess that what you observed is relatively normal in common practice
and many people are quite used to it when using randomization methods
(i.e. most people don't expect to find always exactly the same p value
when using random permutations). If my memory doesn't fail me,
rec
Dear list,
registrations are now open for the international workshop of Introduction
to Geometric Morphometrics using R, to be held in Vairão, Portugal in
October 5-9 2015.
The course will focus on providing an overview of the theory underlying the
quantification of shape using landmark methods,
Dear community,
I would like to share my experience with using some (really cool)
computational tools for phylogenetic signal and morphological integration
analysis.
I am using physignal (geomorph R package) and the Phylo.Morphol.PLS
function provided in the paper by Adams and Felice (2014; P
