[R-sig-eco] PCA for composition data followed by RLQ

[Diogo B. Provete]

Dear members,
I'm trying to run an RLQ analysis to test for a covariation between skull
shape (set of eigenvectors) and diet composition for a set of bat species.
The point is, the data for diet is expressed as percentage, with rows
(species) summing to 100. Therefore, it's better treated as compositional
data.

I have already run a compositional PCA in the R package compositions, which
returns an object of the class princomp. However, ade4::rlq only accepts
dudi matrices. I don't know how to convert a princomp to a dudi object or
perhaps run a compositional PCA in ade4. as.dudi seems not to be called
directly by the user.

Does anyone have any clue on how to do this?

Thank you in advance,
Diogo

-- 

Diogo B. Provete, PhD

Assistant Professor

Biodiversity Synthesis lab <http://diogoprovete.weebly.com/>

Biosciences Institute | Federal University of Mato Grosso do Sul | Brazil


Skype: diogoprovete


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