R: [R] various ordinations

Federico Spinazzi spinazzi at databankgroup.it
Mon Aug 28 11:45:52 CEST 2000

-----Messaggio originale-----
Da: Michael Camann <camann at babylon.cnrs.humboldt.edu>
A: r-help at stat.math.ethz.ch <r-help at stat.math.ethz.ch>
Data: martedì 22 agosto 2000 21.02
Oggetto: [R] various ordinations

>I'm developing a library of functions for community ecology analyses and
>have a couple of questions that I've not been able to answer via faqs or

I'm also working on that, and I would like to integrate it in R.

>1) Are there existing functions for:
>    a) Bray-Curtis (polar) ordination?
I've written a DOS program some years ago and I've reworked the core code,
following E.Beals, 1984.

>    b) non-metric multidimensional scaling (NMDS)?
>    c) canonical correlation analyses (CCA and DCA)?
>    d) TWINSPAN (doubtful...)?

I've the sources of twinspan (I should search them ...). For the other I've
some matlab code, the code developed by Legendre.
However I think the right way would be to port the ADE-4
programs to R.
I know that the source code is public, but I wasn' t able to obtain it two
years ago. As the developers have put links to S-PLUS and Rweb on the cited
web page, I think that a work carried mainly by an istitution could be
appreciated: it would mean to port to R some wonderful methods of data
ecological data analysis: I'm strongly interested in (doing) it.
I've a good background in C programming and in multivariate analysis: I
would like to help if needed and possible.

Federico Spinazzi

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