[R-sig-eco] Partitioning variance with VarPart - permutation test on difference between fractions
Frank Dziock
frank.dziock at tu-berlin.de
Tue Feb 3 17:06:11 CET 2009
Hi there!
I am analyzing a dataset on hoverflies along an altitudinal gradient and
I managed to partition the variance explained among four predictor
variable sets (CLIMATE, RESOURCES, STRUCTURE, and SPACE) in R with
varpart and tested the significance of the (testable) fractions by
single (partial) RDAs.
However, how can I test whether two fractions differ significantly from
each other in R with the permutation test proposed in the Ecology paper
by Peres-Neto et al. 2006?
I know there is an executable program in the appendix of that paper, but
I would like to continue my analysis in R. Does anybody know of an
available R command or R code to test whether two fractions differ?
Best wishes from windy Berlin (+2 degrees, no snow),
Frank
--
Prof. Dr. Frank Dziock
Animal Ecologist and Head of Department (Juniorprofessor)
Department of Biodiversity Dynamics
Technische Universitaet Berlin
Sekr. AB 1
Rothenburgstr. 12
D - 12165 Berlin
Germany
Tel: 030 – 314 71368
Secretary Gisela Falk
gisela.falk at tu-berlin.de
Tel: 030 - 314 71350
Fax: 030 – 314 71355
http://www.biodiv.tu-berlin.de/
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