[adegenet-forum] spca and spatial weights matrix of proximity

[Jombart, Thibaut]

Hello,

yes. Additional constraint on the matrix is:
- values >= 0 
- diagonal = 0
- row-sums = 1 (use prop.table)

Cheers
Thibaut
________________________________________
From: adegenet-forum-bounces at lists.r-forge.r-project.org [adegenet-forum-bounces at lists.r-forge.r-project.org] on behalf of Benoit Barrès [benoit.barres at helsinki.fi]
Sent: 17 January 2013 09:36
To: adegenet-forum at r-forge.wu-wien.ac.at
Subject: [adegenet-forum] spca and spatial weights matrix of proximity

Dear Thibaut,

I want to use sPCA with a spatial weights matrix and I will need a confirmation on the term “spatial proximity”. Am I right to think that the more the entities are close to each other, the more the proximity value will be high? Maybe it seems obvious, but I just want to be sure of that.

My Best,

Benoit

--

Benoit Barrès, Ph.D
Species Interactions in Metapopulations
Metapopulation Research Group
Department of Biosciences
PO Box 65 (Viikinkaari 1)
00014 University of Helsinki
FINLAND