Karla Shikev --

> I just want to take a tree with node labels (e.g.
> bootstrap values from a RAxML analysis) and collapse all nodes with support
> values below, say, 90%.


People here have given you various ways of doing this in R.  I am not
very familiar with the R packages, but just wanted to add one more
way.  If you have the original set of trees that were used to get the
bootstrap values, you can do a version of the bootstrap that makes a
tree which shows only the groups that are present in 90% or more of
the input trees.  This is called an M(0.90) consensus tree (the 0.90
is in a subscript which I can't typeset in an email).  It is available
in the program Consense in my PHYLIP package, and also in some other
phylogeny packages.   If you prefer R you can use Liam Revell's
Rphylip package, together with installing a copy of PHYLIP, as Rphylip
serves as a front-end for PHYLIP within R.

J.F.
-----
Joe Felsenstein         j...@gs.washington.edu
 Department of Genome Sciences and Department of Biology,
 University of Washington, Box 355065, Seattle, WA 98195-5065 USA

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