[R-sig-phylo] Comparative Methods and Pseudo-Traits

2011-11-10 Thread David Bapst
Hello all, A recent discussion set my mind thinking on a particular issue and, once again, I decided to ask for the general opinion of R-Sig-Phylo denizens. It may be easier to start with an example. Let's say that there exists a worker who is measuring several different traits across a number of

Re: [R-sig-phylo] Comparative Methods and Pseudo-Traits

2011-11-10 Thread Liam J. Revell
Hi David. In general it is inconsequential whether X or Y are biologically inherited traits; but whether the residual error in Y given X is correlated or independent among species. In the case of growth rate as a function of habitat degradation this corresponds to: Growth Rate = beta0 +

[R-sig-phylo] cophyloplot rotate hangs

2011-11-10 Thread Walter, Mathias
Hi, I try to rotate a cophyloplot. Unfortunately, it crashes my R GUI (2.13.2 and 2.14.0, Windows) as well as Eclipse 3.7.1 with StatET 2.0.1 on Windows and Eclipse 3.6.2 with StatET 2.0.1 on Fedora 15 and the native R binary started from the shell. It seems like it is depending on the tree size.

Re: [R-sig-phylo] Comparative Methods and Pseudo-Traits

2011-11-10 Thread Joe Felsenstein
Liam wrote: I'm not sure I entirely agree that we need to assume that the environmental trait is evolving on the tree by Brownian motion. I believe that so long as Y|X (in David's example, growth rate given habitat degradation) is evolving by Brownian motion, we should be OK to use PIC

[R-sig-phylo] tanglegram optimization

2011-11-10 Thread Walter, Mathias
Hi, does anyone know an R package or function which is able to draw/optimize tanglegrams (two dendrograms sharing the same leafs [not necessarily identical]) so that it minimizes crossing edges? The APE package contains the function cophyloplot to draw tanglegrams but it does not optimize the