[R-sig-eco] Contrasts for Adonis in Vegan
Emma Stone
Emma.Stone at bristol.ac.uk
Wed Oct 13 12:38:33 CEST 2010
Hi guys,
Just wandered if anyone can help regards contrasts for adonis in the
Vegan package.
I am running the following code for adonis
adonis(formula = resp ~ roostfact + impactfact + sppfact, data = alldata,
permutations = 999, method = "euclidean")
And would like to run a contrast on the impactfact which has three levels.
I have tried setting it up using the following code:
contrasts(impactfact)<-cbind(c(-1,0,1),c(0,-1,1))
contrasts(impactfact)
But I am not sure what to do next can anyone help at all?
Thanks
Emma
----------------------
Emma Stone
Postgraduate Researcher
Bat Ecology and Bioacoustics Lab
& Mammal Research Unit
School of Biological Sciences,
University of Bristol, Woodland Road,
Bristol, BS8 1UG
Email: emma.stone at bristol.ac.uk
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