On Fri, 17 Jul 2015, John Kane wrote:
I think this is more a technical question for the subject matter experts than for R-help if I am understanding the question correctly.
John, I agree completely. Unfortunately, there is no R SIG devoted to CoDA, nor any other mail list or Web forum that I've been able to find. There is a CoDA Web site but no active forum.
That said, there seems to be an R package called compositional and a corresponding book http://www.springer.com/us/book/9783642368080 that may help. If nothing else the names of the author(s) of the package or book or the references may give you some leads on some decent papers.
In addition to compositions, there's robCompositions and zCompositions. The book was where I learned how to analyze compositional data. I've communicated with several of the dozen-or-so statisticians focused on CoDa, and have a couple of dozen papers, book chapters, and proceedings of the triennial conferences on compositional data analyses. I've also written a monograph that demonstrates how CoDA models applied to benthic macroinvertebrate functional feeding groups can assess water quality and be used to set standards. Thanks, Rich ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
