Dear list,
Anybody knows if it would be possible to do a phylogenetic quantile
regression procedure in R or other software?
Im trying to model a relationship in which other factors beyond the ones
which entered in the analysis are potentially misleading the analysis
results. Quantile regression
Hi there,
Is there a PCM that is analogous to the Bartlett test of homogeneity of
variances?
Thanks,
Jason Mustakas
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Several. See these papers for starters:
Garland, T., Jr. 1992. Rate tests for phenotypic evolution using
phylogenetically independent contrasts. Am. Nat. 140:509-519.
Garland, T., Jr., A. W. Dickerman, C. M. Janis, and J. A. Jones. 1993.
Phylogenetic analysis of covariance by computer
Jason,
I think the best way to do this is with the approach of O'Meara et al. 2006
Evolution Brownie.
Liam Revell has implemented this in R in his package phytools. You can
modify the steps taken in this tutorial here
http://phytools.blogspot.com/2011/07/running-brownielite-for-arbitrarily.html
Hi Jason. Matt is absolutely correct. You can do this with phytools.
Say, for instance, you have an ultrametric phylogeny with branches in
millions of years (tree) and data vector containing the trait values for
species (x) and you want to test the hypothesis that the last 3.4 my has
a
Thanks, guys. That's exactly what I needed.
From: Liam J. Revell liam.rev...@umb.edu
To: Matt Pennell mwpenn...@gmail.com
-project.org
Sent: Monday, September 17, 2012 9:22 PM
Subject: Re: [R-sig-phylo] variation in rates over time
Hi Jason. Matt is
I agree with the suggestions so far. I just wanted to point out a few more
alternatives:
You could use the geiger package to estimate the best scaling for the
tworatetree transformation to do this (should be equivalent to the earlier
solutions, though it would require running optimization).
You
