Hi Karla.

phytools has a function called ratebytree for this. This essentially corresponds to the 'censored' model of O'Meara et al. 2006, but we also have a submitted manuscript describing it. I can send you that in a second email.


For more information about using the function you can search for 'ratebytree' on my blog, blog.phytools.org.

All the best, Liam

Liam J. Revell, Associate Professor of Biology
University of Massachusetts Boston
web: http://faculty.umb.edu/liam.revell/
email: liam.rev...@umb.edu
blog: http://blog.phytools.org

On 7/22/2017 3:10 PM, Karla Shikev wrote:
Dear all,

I'd like to test whether the rate of evolution of a phenotypic trait (e.g.
body size) is significantly different among distantly-related clades (e.g.
mammals vs birds). I got tip data and completely resolved and callibrated
trees. One possibility would be to estimate rates and their confidence
intervals for each clade and to compare them directly, but I'm sure there's
a more elegant way to do this.

Karla

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