Dear R-sig-ecology group,
is there a way to use two self-made dissimilarity matrices for the
left-hand side (LHS) and right hand side (RHS) in vegan functions such
as capscale or adonis?
I created those matrices in a GIS using 3D-information therefore I don´t
want to simply use distances betwe
Jens,
You can make your imported dissimilarities into a dist object quite easily.
Say D is your imported dissimilarity data. It needs to be in lower-triangular
format (assuming you imported it as a symmetric square matrix).
D <- as.matrix(D)
D <- D[col(D) < row(D)]
attr(D, "Size") <- N # number
On 13/10/2009 17:51, "Sarah Goslee" wrote:
> Jens,
>
> You can make your imported dissimilarities into a dist object quite easily.
>
> Say D is your imported dissimilarity data. It needs to be in lower-triangular
> format (assuming you imported it as a symmetric square matrix).
>
> D <- as.m
That doesn't make much sense to me. You'd need an entirely different method
than capscale.
Perhaps what you're looking for is more like multiple regression on distance
matrices (implemented in MRM in ecodist)?
Lichstein, J. 2007. Multiple regression on distance matrices: A
multivariate
Hi again,
our distance matrices are 1) genetic distance (Jaccard) and 2)
3D-Euclidean Distance and the question we want to solve is if there is
an effect called "Isolation by Distance" (IBD) in our data (genetic and
"real"-distances of snails on the island of crete) or not. There was a
debate
On 13/10/09 18:44 PM, "Jens Oldeland" wrote:
> Hi again,
>
> our distance matrices are 1) genetic distance (Jaccard) and 2)
> 3D-Euclidean Distance and the question we want to solve is if there is
> an effect called "Isolation by Distance" (IBD) in our data (genetic and
> "real"-distances of
Dear All,
Perhaps, there is another way of approaching this problem: the
Monmonier's maximum-difference barriers algorithm.
Monmonier, M. (1973) Maximum-difference barriers: an alternative
numerical regionalization method. Geographic Analysis, 3, 245–261.
Manni, F., Guerard, E. and Heyer, E. (200
And actually, MRM isn't quite part of the Mantel family, although there
are strong mathematical relationships:
Goslee, S. 2009. Correlation analysis of dissimilarity matrices. Plant Ecology.
Online at: http://www.springerlink.com/content/k4051127l6430nr1/
for subscribing institutions.
It isn't a
