Re: [R-sig-eco] slope for rarefaction curve

Basic algebrra seems to lead to this function: rarederatk - function (x, k) { x - x[x0] J - sum(x) d - digamma(J-k+1) -digamma(J-x-k+1) g - lgamma(J-x+1) + lgamma(J-k+1) - lgamma(J-x-k+1)-lgamma(J+1) d - d*exp(g) sum(d[is.finite(d)]) } Here 'x' must be a vector of species

[R-sig-eco] relate environmental parameters to OTU network

Hi all, I've made a network of OTUs using phyloseq. Now, I'd like to correlate environmental variables to the clusters I observed. Anybody here who has an idea on how to do this exactly? Perhaps there are multiple ways, or if it is possible using another package (network, sna, ...), please

[R-sig-eco] Course: Introduction to zero inflated models with R

Apologies for cross-posting We would like to announce the following statistics course in Palm Cove, Australia. Course: Introduction to zero inflated models with R Location: Palm Cove, Australia Date: 17-21 August 2015 Price: 550 GBP Course website: http://www.highstat.com/statscourse.htm

Re: [R-sig-eco] relate environmental parameters to OTU network

Hi Bjorn, You could check out Local Similarity Analysis (http://meta.usc.edu/softs/lsa/) or alternatively, network assortativity e.g. in {igraph} http://www.inside-r.org/packages/cran/igraph/docs/assortativity Hope it helps, Cheers, Johannes On May 11, 2015, at 4:40 PM, Bjorn Tytgat wrote: