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.


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